Thursday, October 22, 2020

Marssonina blotch

Recently I visited a block of EverCrisp apple trees in an orchard in the hilltowns of western Massachusetts west of the Connecticut River. I went to look at what is probably the largest planting of EverCrisp apples in Massachusetts. A few acres, with more in the works to be planted. The trees are 3-4 years old and on Geneva 41 rootstock. A couple of observations and even more questions.

First, crop load management is essential as EverCrisp can go somewhat biennial if over-cropped. And apple quality is not what it should be on over-cropped trees. What is the best crop load (number of apples) and chemical thining recommendation for EverCrisp?

Second, EverCrisp appears to be quite susceptible to the fungal disease Marssonina coronaria causing the symptom Marssonina blotch. Now, the big question is how important is it to keep this disease under control until the fall harvest? These EverCrisp had not been treated with a fungicide in well over a month, and groups of trees showed signifiacnt Marssonina blotch. Even some partial defoliation. The grower acknowledged that Marssonina blotch has been observed on these EverCrisp trees in the past. A standard fungicide program for apple scab -- that includes Captan and mancozeb fungicides, because it appears these fungicides have good activity against Massonina -- should keep it at bay for the majority of the growing season. Slacking off on fungicide applications towards harvest, however, can result in Marssonina blotch becoming rather "ugly." So my questions include:

  1. Will letting the disease build up -- it overwinters in leaf litter on the orchard floor -- make it more difficult to control in future years? (Remember, sanitation is a basic tenet of plant disease control.) 
  2. What are the ramifications of late-season "leaf blotch" and partial defoliation on tree health and productivity?
  3. What fungicides have best action against Marssonina, and how late into the summer or early fall should fungicide application continue?
  4. What weather conditions are most favorable for Marssonina infection? Surely moisture is an essential ingredient, and in fact, RIMpro has a Marssonina coronario infection risk model. Migh be worth heeding.

I know some of these questions are currently trying to be answered by University researchers in the Northeast, but Marssonina is a relatively new apple disease here and EverCrisp appears particularly susceptible. Both it's parents, Honeycrisp and Fuji, are known to be susceptible to Marssonina. So keep an eye out on those EverCrisp blocks!

Marssonina leaf symptoms on Evercrisp apple, 20-October, 2020

Under magnification, dark spots are diagnostic for Marssonina

Typical Marssonina "hot spot" in EverCrisp trees on 20-October, 2020; trees in background are less afflicted; defoliation of heavily diseased trees is occurring

RIMpro Marssonina model for the UMass Orchard, Belchertown, MA

Saturday, April 11, 2020

2015 Modi Organic NC-140 Apple Rootstock Trial and Drapenet Demonstration

Blogger note:waiting too long for this to appear in Fruit Notes/Horticultural News. Sorry Wes and Win...

Jon Clements, Elizabeth Garofalo, and Wesley Autio

This NC-140 ( rootstock planting in a commercial “Certified Naturally Grown” (CNG, orchard gets more disappointing every year. In 2019, now in its fifth-leaf, more trees are dying or failing, and fruit quality and yield in 2019 was pretty abysmal. It’s unclear if low fruit set and yields are a result of pollination issues or the “organic” management regimen? In 2018 there were virtually no apples, but the entire rest of the CNG orchard was light too. In 2019 the CNG orchard had a good crop, but these Modi trees had a light to moderate crop (at best) of apples. Another problem was the amount of insect damage, mostly plum curculio and internal lep worms (codling moth or Oriental fruit moth) which made the CNG apples quite deformed and small in size. Weed control and fertilization remain organic orchard issues. My take home to date is that G.890, because of its vigor, is a good choice for organic orchards. Although G.30, G.202, and G.41 are acceptable too. (Maybe throw G.969 and G.214 in the ring?) G.16 is not right in this planting, and M.9 has really under-performed. G.935 has some issues, wondering if it is the virus/rootstock/scion interaction? Liberty trees on G.935 planted between replications and as guard trees have all died. Marssonina leaf spot was confirmed in September, and has been causing early defoliation of these Modi trees.

In 2019 a Drapenet ( was installed over replications 1-6 (and not 7-12, there are two rows) the primary objective being to see if insect damage could be reduced. (Although there was a lot of hail around in 2019.) The Drapenet was installed on May 19, 2020 during late bloom, and was secured to the bottom wire with plastic wire ties. Inspection of the apples in late June showed that it was pretty much wholly ineffective at preventing plum curculio damage, however, a more formal harvest survey of 100 fruit per treatment (covered with Drapenet vs. uncovered) for damage showed that internal worms, mostly likely caused by codling moth or Oriental fruit moth, were greater in the uncovered (35% damage) vs. covered (12% damage) replications. But, as already mentioned, PC damage was greater in covered (80% damage) vs. uncovered (51% damage). Interestingly, the incidence of apple maggot fly injury was also greater in the covered (26%) vs. uncovered (5%) apples. Sooty blotch/flyspeck was also greater in the Drapenet apples (59% for sooty blotch, 21% for flyspeck) than the uncovered apples (19% and 12% respectively for sooty blotch and flyspeck). Note that at the UMass Orchard Modi performs just fine, and in fact, was one of the most beautiful apple crops I have ever seen. (Modi apple pictured above.)

These results are just investigatory, as the covered vs. uncovered was not randomized and replicated for statistical analysis. But a recent article in Fruit Quarterly ( also showed (research conducted at Michigan State University) that Drapenet is effective at reducing/minimizing flying moth damage (codling moth, Oriental fruit moth, oblique-banded leafroller).

Note that Modi is not available to apple growers outside of a California packing house ( It was bred in Italy, a cross of Gala X Liberty and is scab-resistant. It has been marketed in Europe as an enviro-friendly apple (

Installation of Drapenet on 15-May, 2019 over Modi apple trees in the
2015 NC-140 Organic Apple Roostock Trial in a CNG orchard.

Tree and yield characteristics in 2019 of Modi apple trees in the 2015 NC-140 Organic Apple Rootstock Trial in a CNG orchard.

Trunk cross-sectional area (sq. cm. trunk area) and cumulative yield efficiency (2017-19, kg. apple per sq. cm. trunk area) in 2019 of Modi apple trees in the 2015 NC-140 Orgamic Apple Rootstock trial.

Typical insect damage (and russet, Septmber 2019) on Modi grown in in a CNG orchard, includng plum curculio, Oriental fruit moth, and apple maggot fly.

Friday, March 20, 2020

Improvements to MaluSim (Cornell Apple Carbohydrate Thinning Model)

In the most recent Fruit Quarterly (Vol. 28, No. 1, Spring 2020) Dr. Terence Robinson and co-authors introduce some improvements to the Cornell Apple Carbohydrate Thinning Model, also known as MaluSim. If you remember, MaluSim is a decision support tool to help make effective chemical thinning applications based on predicted thinning efficacy. Inputs to the model require temperature and sunlight which are derived from a NEWA weather station. Outputs include a daily Thinning Index and recommendation to increase or decrease chemical thinner rates. Many apple growers have indicated the MaluSim (Apple Carbohydrate Thinning) is one of the most widely used decision support tools on NEWA: 
The rationale behind Robinson making these changes/improvements to MaluSim are based on their annual study from 2000 to 2011 where experimental thinning treatments (using carbaryl, NAA, and 6-BA) were applied to apple trees in Geneva, NY and annual data on flower bud density and then cropping (yield, fruit size) was recorded. Weather data was input into MaluSim where a daily carbohydrate balance during the chemical thinning period was calculated and compared to the crop load at harvest. It turns out:

  • The greatest effect on fruit set was timing of chemical thinning application, with the best thinning occurring at 200 to 250 degree days (Base 39 degrees F.) Note that king fruit diameter centered about 12 mm during this window. (I remember my MSU colleauge Phil Schwallier, who has done many chemical thinning trials over the years, saying he has consistently got the best results when chemical thinners were applied when fruitlet size was 10 to 12 mm.)
  • Initial flower counts (bloom intensity) have to be taken into the equation too. When there are more flowers, more aggressive thinning is needed vs. having fewer flowers.
  • Carbohydrate balance also had an effect on fruit set, but was much reduced (or non-existent) outside of this degree-day window of 200-250 DD’s.
  • And, the actual daily carbohydrate balance should be expanded to a longer period before and after the thinning application compared to the “old” MaluSim which used a 4 day running average to compute the daily carbohydrate balance.
So, based on this research the new Cornell Apple Carbohydrate Model on NEWA (Apple Carbohydrate Thinning v2019) was modified as follows:

  • Users must input % flowering spurs before running the model, with four choices: 76-100%, 51-75%,, 26-50%, or 0-25%. (Note the user must also input green tip and bloom dates. Don't accept the NEWA default green tip date, enter your own. Bloom date should be when 80% of the flowers are open on the north side of trees.)
  • Degree Days are automatically calculated, summed, and highlighted in the DD column when they are in the range of 200-250 DD’s (Base 39 degrees F.) from bloom.
  • Calculation of the “Thinning Index” (daily carbohydrate balance) is expanded to seven days (two days before the day of thinning to four days after)
  • And, thinning recommendation, taking into account % of spurs that are flowering, DD’s from bloom, and carbohydrate balance over seven days (all per above) will be color coded red=high risk of over-thinning, yellow=caution, possible over-thinning, green=expect good thinning, and blue=little or no thinning expected.
In 2019 the older Cornell Carbohydrate Thinning Model will be replaced by the new and improved Apple CHO Thinning v2019 MaluSim model and you are advised to use that. Note that CHO thinning is also available in the Malusim app available on both iOS and Android smartphones for mobile access to thinning recommendations.

Cornell Apple CHO v2019 NEWA interface

Cornell Apple CHO v2019 NEWA output

Sunday, October 20, 2019

"Adventures" in apple thinning in 2019

Is it just me or is it every time I think I chemically thinned apples adequately, come July, it’s like where the heck did all those apples come from? In the ideal world, we would have a hoard — I mean literally thousands — of people, out there hand thinning in June. Obviously not going to happen. Therefore, chemical fruit thinning remains one of the most challenging AND most important spray(s) of the year. Some of my “adventures” in apple chemical thinning in 2019 follow.

The nibble fruit thinning approach as espoused by Dr. Duane Greene at UMass was advisable. This includes using NAA (Fruitone, PoMaxa), carbaryl (Sevin), and 6-BA (Maxcel, Exilis) at the appropriate timing (beginning at bloom and continuing through 10-12 mm fruitlet size) and during good weather (warm, partly cloudy, neither of which occurred together at a particularly good time). Still, this approach generally resulted in inadequate thinning. Apple trees were rarely under considerable carbohydrate stress during most of the chemical thinning window for chemical thinners to be particularly effective. But, it (nibble approach) definitely did some thinning. Some might argue the results were acceptable. But I am tired of too many small, clustered-up apples, particularly when it comes to crop-load sensitive varieties like Honeycrisp wherein fruit quality (size, red color, and flavor) suffers.

NEWA output, apple carbohydrate model, UMass Orchard, Belchertown, MA

The Pollen Tube Growth Model. 
New this year, I followed it (the PTGM, closely, fully intending to apply lime sulfur to a block of Honeycrisp. Which I did. The result, it smoked the flower petals at a high rate! I was pleased. I was so pleased — and a bit scared! — that I did not follow-up with another application of lime sulfur, which is advised per the PTGM to get that last cohort of flowers, including lateral bloom, that was pollinated. Kind of a mistake, as although the lime sulfur spray at bloom definitely resulted in king fruit set only (mostly?), at the end there was still too many apples on these trees! Hand thinning followed in the summer. Note to self, don’t be gun shy, follow the recommendation of the PTGM. Of course if I do it again next year, and apply lime sulfur twice, I will probably strip the trees! (Would not be the first time, see below.) So, who out there is willing to give bloom thinning with caustic thinners a go in 2020?

Honeycrips flowers after 4% lime sulfur solution application
The result on most clusters after lime sulfur application. Sweet!

Malusim app and the fruitlet growth rate model. I used the Malusim app ( in its first year of general release to help measure apple fruitlets and predict fruit set (using the fruitlet growth rate model.) Four varieties — Pazazz, Gala, Fuji, and Honeycrisp. Two sets of trees — five trees per variety, five (only) flower clusters per tree. Only 25 flower clusters per variety. Suppose to do 75. Trying to see how little I can get away with, yup, I’m lazy, I’ll admit it. The result, well, interesting. Seems like things were pretty much on track. With the exception of the lime sulfur application, all other trees received the standard UMass chemical thinner application(s), whatever that was. I won’t bore you with all the details, you will have to wait for an upcoming jmcextman blog or Fruit Notes article, but suffice it to say, in the end, still too many apples at harvest. Too damn many.

Malusim app output predicting fruit set of Gala apple trees in 2019 at the UMass Orchard

Yes you can, strip trees of apples that is. Using ethephon. And 6-BA. And Vydate. Yup, I did it, Golden Delicious, really sick of hand thinning in the past, so a tank mix of above did it. Really did it! And fruits were about one inch diameter! Bottom two-thirds of trees, all apples fell off beginning about a week after application. Interestingly, top one-third of trees had a nicely thinned crop. Shows you where the spray hits and where spurs are weaker (more shaded). Also, there was a pretty good carbohydrate deficit around application. Good thing I don’t make a living doing this.

One more quick note, multiple applications of ReTain, again using Duane Greene’s recommendation, did a nice job of holding Honeycrisp on trees and they took on real nice color in October. A major PYO orchard in easter MA confirms this approach. For more information:

Honeycrisp apples at Tougas Family Farm on 10/18/19 that were treated with ReTain

Wednesday, August 21, 2019


Yes, my blog seems to be heavy on #IFTA (International Fruit Tree Association) posts. Probably because it's one of the more interesting, and photogenic things I do all year? mine pales in comparison to coverage by Good Fruit, Growing Produce (American Fruit Grower), and Fruit Growers News (see links at end), but it's a good exercise for me to document. Make sure you also check out #iftaontario on Twitter.

#IFTAONTARIO Headquarters, Hamilton, Ontario, CANADA, a port city of just over half-million people on the west shore of Lake Ontario. Major economy is manufacturing and is the steel capital of Canada. We got the impression it is a diverse city too, 25% of the population was not born in Canada. (Curious how that compares to major U.S. cities?) A real interesting and copiously stocked food store housed in the mall below the Sheraton hotel called Nations Fresh Food...and had some pretty nice calamari (and margaritas) at a Mexican restaurant called TheMule. Dinner company with Lisa Jenereaux (IFTA President) and Pedro Cuevas, Semios Washington Account Manager. I learned a lot about Semios Automated, Remotely Controlled Climate, Insect and Disease Monitoring and Treatment.

Yummy fried calamari at TheMule in Hamilton

DAY 1 -- Orchard tours in the Norfolk region, mostly west of the Niagara escarpment.

Stop 1: University of Guelph Research Station with U. of Guelph Dr. John Cline and OMAFRA's (Ontario Ministry of Agriculture, Food, and Rural Affairs) Amanda Green. Dr. Cline discusses preliminary results of 2014 NC-140 Honeycrisp apple rootstock planting featuring Vineland and Geneva rootstocks. Here is a preliminary report prepared by Dr. Cline. From the report "V.5, V.6, and V.7 appear to be more vigorous and slightly less yield efficient (than G. 935), but offer cold hardiness and resistance to fireblight (rootstock not scion resistance)." Also see the planting page on And Amanda Green told us about the significant parternships in Canada to develop and test new apple varieties. We also made a quick stop at a cider variety planting/trial as there is significant interest in apples for making quality ciders in Canada (as well as the U.S.).

Dr. John Cline with the cider apple variety planting

OMAFRA's Amanda Green talks about new apple variety evaluations
Stop 2: Hedges Apples, wow, owner and IFTA Director Chris Hedges is managing 250 acres of apples (including 75 acres of new plantings) as well as owning and operating Ontario Orchard Supply. Formerly a banker, you can tell Chris is into analyzing all aspects of his operations. And I doubt he works bankers hours anymore! We had lunch in his brand new 10,000 bin CA cold storage. At Hedges Apples, we were also treated to a demonstration of Crop Adapted Spraying by showman Dr. Jason Deveau, OMAFRA Application Technology Specialist. I won't get into the details, you can see much, much more at but I did like that H.S.S. "airblast" sprayer. After listening to Jason, I hesitate now to call it an "airblast" sprayer though.

Chris Hedges elaborates on his many jobs running 250 acres of apples plus Ontario Orchard Supply

Dr. Jason Deveau makes spray depostition entertaining but with an important message!

Stop 3: After lunch at Hedges new cold storage, we made a non-orchard stop at Northland Ginseng Farms. Ontario can produce a high-quality Ginseng root, but the challenges are many, including land availability (crops have to be rotated after a 4-5 year growing cycle) and Chinese competition of inferior quality ginseng, according to the farmer. But Phil Schwallier sure seemed interested?

"Hey, this looks even harder than growing apples, maybe?" says Phil Schwallier of ginseng.
Stop 4: On to Norfolk Cherry Company, where a scheduled tour of the tart cherry packing company was put on logistical hold. We spent most of our time looking at a young (planted 2018), free-standing Honeycrisp block on V.1 rootstock. I have no pictures, which maybe says something -- it was not bad, but could have just as easily been a free-standing young tart cherry planing if you get my drift. Will be interesting to see how it turns out?

Stop 5: Last stop for the day was Lingwood Farms. A bit of a downer because co-owner Ken Porteous has no real good succession plan in place right now, despite the orchard having been around since the mid-1800's. Still, a solid, good, well-executed orchard despite some recent challenges with a tornado (support sytem held up), fire blight, and black stem borer. (I'll put my 2 cents in here and say it's really not the black stem borer that is the problem, it's something else -- cold injury, wet feet, canker? -- weakening the trees and making them susceptible to invasion by the ambrosia beetles. Chicken-egg? Egg- Chicken? IMHO.) We looked at Ken's 3rd-leaf Gala tall-spindle "tipped"trees, AKA Wafler system. Seems to me there was pretty good approval of it...

The IFTA crowd gathers at Lingwood Farms to listen to Ken Porteous discuss his recent orchard challenges

3rd-leaf tall-spinde "tipped" Gala apple trees at Lingwood Farms

DAY 2, beginning with two-hour bus ride to Georgian Bay. 

The ride was not too bad as the Ontario countryside -- once out of the greater Toronto metro -- was quite lovely.

Stop 1: To No End. Not remembering a lot here, the manager was a bit of a character, was not afraid to tell it like it is/was. I have minimal notes, so I don't remember too many details, but he was doing his own (I think) two-leader apple trees. This was a no-nonsense orchard, that overall looked good as did the 2-leader trees. I thought anyways. Maybe I was just a bit groggy after the bus ride?

Looks like Leslie Huffman (OMAFRA, retired, and barn quiltand vinegar lady)
leads the discussion at To-No-End
Two-leader and Gala block at To-No-End.
Stop 2: Sandy Creek. After a wonderful lunch at a private ski lodge/club, manufactured orchard from Italy at Sandy Creek. Planted this year. Want one? Order it up -- Might be hitting $70,000 per acre complete with cement posts, wire, irrigation (trickle and overhead for frost protection), and hail net. (Want DIY cement posts? Includes installation. 30 acres? (Was suppose to be 60, but could not get it done this year.) Can't remember, don't think trees were included, but they are included in that app. 70 grand price tag. (I may be on the high side, but I think it's close. So what if it was more like $60,000?) Solid Honeycrisp, I think the plan was to install some pollinators. Some trees were flagging a bit which would concern me. Interestingly, the manager was a field crop guy (corn and soybeans) so this was all new to him. Their consultant was notably absent but I guess he only spoke Italian so that was kind of a no-starter. I don't know, will be interesting to see if they can make any money before the Honeycrisp market goes south. (If/when it ever does?) Kudos to them if it works out.

Explanation of process and costs associated with manufactured orchard by at Sandy Creek.

Nice place to stand and enjoy the shade provided by hail net. Outstanding looking, but prepare to get out the big checkbook. Note a couple trees on right are not looking so good, would concern me after spending that much money. Fire blight? Site issue? Phytophthora? Not sure...

Stop 3. Apple Springs Orchard with frequent IFTA travler Kyle Ardiel (and father Shane). Another cooperative apple variety trial planting, and a vjust-planted, rather experimental IMHO, V-trellis apple block that included a new Honeycrisp strain from U. of Minnesota with presumably redder sking color? Kyle represents a new generation of apple farmers given the latitude by their parents to try out new ideas while continuing with the family orchard. Best wishes to the young growers, we hope they continue the two-way learning relationship with IFTA.

Young, experimental V-trellis, including spring-grafted, numbered red-strain Honeycrisp from U of MNat Apple Spring Orchard.

Stop 4. T & K Ferri Orchard, including dinner in the orchard. Tom Ferri is a hard-working, rather animated character who's life appears to be his orchard. Tom has been cultivating super-spindle trees for a while now, and in a harsh environment up there has recently suffered some tree loss to SAD (more on that later), but overall the manicured orchard looked fantastic. Tom and a computer-savy partner lead a discussion on precision thinning using the fruitlet growth rate model. Karen hosted a catered "communal" dinner in the orchard which was a delicious and perfect way to end Day 2 of #iftaontario. Very satisfied. Sharing some wine with good company/friend and MSU Extension Agents Amy-Irish Brown and Phil Schwllier helped. I learned Phil likes his Kentucky Fried Chicken while on the road back home!)

Tom Ferri (right) and collaborator talk about how they modified the apple fruitlet growth rate model to suit their needs. They did the procedure on many blocks with mixed results. Typical of chemical thinning anomalies that everyone experiences! Got to have a bit of luck thrown in the mix to get it perfect! In other words, "precision" is a bit of an oxymoron! Weather rules!
Beautiful super-spindle Gala at T&K Ferri Orchards. Maybe a little over-thinned, eh? Otherwise perfect!

FINAL DAY 3, including return to Hamilton.

First, a couple stops in the morning while departing Georgian Bay.

Stop 1. Botden Orchards. Equipment display and description of operation of each -- which of course had all the guys (and maybe a few gals?) typically oohing and aahhing, equipment displays always a big hit at these IFTA tours -- by owner Marius Botden. And then a quick discussion about smaller tools used in the orchard to assess fruit quality and growing conditions (soil moisture) byMost notably -- I think, I'm not an equipment guy! -- Boden Orchards is the exclusive grower of the Red Prince apple, which is a trademarked strain of Jonagold from Belgium. A very engaging stop overall.

Marius Botden at beginning of equipment discussion, Botden Orchards. That rather ET-like contraption in the background is an over-the-row sprayer. Marius is afraid of heights, so he has never been up in the "cabin!"

Gerbe Botden talks about some tools used to monitor orchard conditions and fruit quality while IFTA Board member Jim Engelsma listens intently.

Stop 2, and last stop in Georgian Bay before heading back to Norfolk regions, was Bamford Family Farms where OMAFRA's Kristy Grigg McGuffin talked about SAD/RAD, Sudden Apple Decline/Rapid Apple Decline (the latter seems to be preferred, otherwise it is just too sad). Seems this pheomenah of Rapid Apple (tree) Decline is caused by a series of environmental insults that might include winter injury, poor site conditions, and plant pathogens (including fire blight). Young- to middle-aged on dwarfing rootstocks pushed to the limits of production seem to be most afflicted. (But of course there are many such healthy trees too.) Bottom line -- no easy answer, keep trees happy and fingers crossed. Oh and it's all about Location, Location, Location I think. :-) Throw in some good management too. We did look at some older (15 to 18 years) bearing blocks planted on M.9 too.

Wrapping it up with Stop 3 at Chudleigh's Farm back in the greater Toronto metro. Total change of pace, Chudleighs is a direct market, destination, agri-tainment mecca. Owner Tom Chudleigh's apple blossom pastries are legendary and lived up to expectations. I found their choice of some of the pick-your-own varieties, which included Canada-bred (out of British Columbia) Sunrise, Silken, and Creston, along with Honeycrisp, Ambrosia, Cortland, and (maybe) some Macs, interesting. Many direct-market tips and tricks here including wide rows for customer breathing room (they get very, very busy on fall weekends), large, bright red apples on the trees, and entertainment and food for those in the family not all that into just apple picking. They might be called "dads" and "boyfriends?" :-)

Tom Chudleigh and co-workers talk about their PYO varieties and systems. It's different than what we saw already, trust me. Use of hay mulch is interesting, but voles are not a problem with the turf-like groundcover management. But that is one of the least interesting points of Chudleigh's.

Want more? After reading all this? OK...

And don't forget to check out #iftaontario on Twitter! Eh?

Friday, May 24, 2019

How to use the Malusim app

The Malusim app is a tool that includes the fruitlet growth rate model, apple carbohydrate model, and an irrigation model. I am just going to cover setting up and using the fruitlet growth rate and apple carbohydrate models here.

Start by going to on your computer (or tablet) and register for an account. Also, go to the Apple or Google stores on your smartphone, search for “Malusim,” and download the app. Sign in using the same account you registered on your computer.

Next, ADD A LOCATION. You will be presented with a Create Location form. Note which fields need to be filled out for the fruitlet growth rate and apple carbohydrate models. Later you can come back and fill out the fields for the irrigation model if you decide to use that. You have to choose the closest NEWA weather station, preferably your own station. Be sure to click the checkmark in upper right to SAVE your LOCATION.
You have to create all your locations, which are typically your management blocks by variety. Be sure to use the check mark (upper right) to SAVE your LOCATIONS!
Once your LOCATION(S) are created, click on the LOCATION and you can then select which Model you want to use.

Four locations here, click on the location to select which Model you want to use. Add more locations as necessary using the + ADD LOCATION green button.

Once your locations are created and you have selected a location, you will be presented  with the location details and choice of model you want to use -- the green buttons.
Choose the green button Fruit Growth Rate Model. Here you have to Edit the Fruit Growth Rate Dataset. To use the Fruit Growth Rate Model, you have to enter the “# of Trees” you are going to measure fruits (5 to 7 per variety per block recommended), the “# of Clusters per Tree” you are going to measure (15 recommended, 10 at a minimum), the “# of Fruitlets per Cluster” (use 5) and “Flower Clusters Counted per Tree” (terminal flowers only, not lateral flowers on 1-year old wood). You also have to set a Target Fruit per Tree based on experience, and what is expected of the trees in terms of yield per acre. Tall-spindle apples, depending on variety, typically carry 65 (Honeycrisp) to 100 (Gala) apples per tree. Again, make sure you click the check-mark to save your Dataset.
For each location, you have to Edit Fruit Growth Rate Dataset before you can use the Fruit Growth Rate Model
Once you have this all set up you are ready to begin measuring fruits. Go back to green button Fruit Growth Rate Model, click the green + button under Measurements.

Click the green + under Measurements to begin using the app to collect fruit growth measurements.

You will be presented with a data entry form for individual fruit measurements. When using the phone app, there will be the option for voice input. Otherwise, you can enter with the keyboard. All Measurement data is automatically saved and synced between the phone app and the web app. Still, it’s a good idea to check your work frequently making sure it is recorded and saved correctly! For more information on the Fruit Growth Rate Model, see Predicting Fruitset Model. Also note there is a yellow Help button (upper right, most windows) for further explanation of what’s needed to use the Malusim app.
Enter Measurements window as it appears on computer in browser window. You can manually enter measurements using the keyboard. Note this should also work on phone or tablet, however, it's recommended to use the app on those devices.

Enter Measurement screen in iPhone. (Works on Android too.) Note the microphone icon for voice input of the fruit measurements.
With successive measurements, you will see the results of the Fruit Growth Rate Model in a chart of Predicted Fruit Setting. Note there is also the option of entering chemical thinner Spray Records (green button under Location Details).
The result after four dates of fruit measurements. More thinning still needs to be done to achieve the Target! May 21 does not show here on the axis, but if it did, there would be a vertical line showing the application date.
Additional information:

Predicting Fruitset Model (Michigan State University, Phil Schwallier and Amy Irish-Brown)

MFGA Meeting and Malusim app (

YouTube video using the Malusim app with voice input (Jon Clements, June 3, 2018)

Precision chemical apple thinning in MA in 2017 (

Thursday, March 7, 2019


Last week, February 25-28, 2018, 350 fruit tree growers, researchers, educators, and industry representatives got together in Rochester, NY for the International Fruit Tree Association (IFTA) Annual Conference. I can't begin to recount all that went on -- after all, there were two full days of Conference education sessions, and two full days or orchard tours -- but I will summarize some take-home messages here. Speaking of messaging, search #IFTA2019 on Twitter if you want MORE! Lots MORE! Over 300 Tweets to be exact!

George Kantor, CMU, Robert Carlson Lecture
Monday, February 25 - Day one of education program with an AM themed session "Who Moved My Trees?" and a PM session "Using New Rootstocks to Improve High Value Apple Production." Leading off the AM was George Kantor of Carnegie Melon University, who during the Robert Carlson Lecture talked about orchard sensing and automation. Interesting, dynamic speaker -- one screen sums it all up -- "AI (Artificial Intelligence) is coming: It will bring changes, you can start getting ready for it now, and you can help shape it." In the PM, although all the talks by scientists who are part of the SCRI funded Root2Fruit project were useful, I found Lailiang Cheng's of Cornell University talk on "Control of Honeycrisp Bitterpit: Use of Rootstocks and other Strategies" particularly interesting.

Lailiang Cheng summary screen on Honeycrisp bitterpit management
Tuesday, February 26 - Orchard tour west of Rochester to Orleans County. Six
 orchard stops. I will highlight three. Excelsior Farms with Roger Bannister. Multi-leader Pazazz trees that in 4th-leaf produced over 1,000 bushels per acre. Honeycrisp, on same system under-performed at about 600 bushels per acre. Challenges included time spent training and pruning, i.e. getting the multiple leaders uniform. But fruit quality is very high.

Roger Bannister w/ Cornell's Mario Mirando Sazo, Exclesior Farms, multi-leader Pazazz
Lamont Fruit Farm, Inc. with Jason Woodworth and Jose Iniguez. Super-spindle Honeycrisp, Gala, presumably a few other varieties. (SweeTango, Koru, Smitten club varieties included.) Mostly on B.9 rootstocks. Planted app. 2 feet by 11 feet. Very nice -- grow the tree up in the nursery (they have their own) and a year or two in the orchard, then stand back and enjoy growing uniform fruit of targeted sizes. According to them. But they made it look easy.

Jason Woodwoth and Jose Iniguez in super-spindle Gala/B.9 planting. Very nice.
Oh, and that is Bill Broderick on the left, Sunnycrest Orchard, Sterling, MA.
Kast Farms, Inc. Cornell-Geneva rootstock trial with Gennaro Fazio. Delicious as scion. Interesting, but not too many surprises here. I kind of spaced-out because not too interested in Delicious. (Only real interest is right rootstock for Honeycrisp!) CG. 2013 might be their next rootstock release? Did I mention yet it was cold and getting colder -- Gennaro's fur hat got compliments from back home.

Fur-hatted Gennaro Fazio with Cornell-Geneva rootstock planting at Kast Farms
Tuesday evening, IFTA Social Event 2019 (no Banquet, some seem to think it is getting dated) at Artisan Works in Rochester. Artisan Works was pretty mind-blowing spectacular! And the food and company was not too bad either...👍

Wednesday, February 27 - Another day of education inside. Plus a very special event in the evening. First, in the AM "Realizing the Potential." Including the Wallace Heuser Lecture by Nick Dokoozlian of EJ Gallo Winery. You know, what I got out of his talk is that the grape industry, particularly the big wine grape guys, are ahead of us. Way ahead? Maybe not, the big tree fruit growers are adopting new technologies and catching up and trying to match the wine grape industry's obsession with fruit quality and profitability.

Nick Dokoozlian, E&J Gallo Winery, this screen sums up his talk
I also particularly liked WSU's Bernardita Sallato's talk on "Orchard Nutrient Management and Diagnostics," and the "Advances in Tree Fruit Nursery Technologies: Panel Discussion" lead by Greg Lang. No pictures on that, but there was a diversity of nursery production methods espoused by Willow Drive Nursery, North American Plants, Sierra Gold Trees, and Helios Nursery. I liked the one-year bench grafts being produced by Willow Drive.

Bernardita Sallato walked us through a step-by-step nutrition diagnosis, here with soil test optima
Oh, and at the beginning of the AM session was a special tribute and moment of silence to Wally Heuser, founding father of IFTA, who passed away last month at the age of 90. Wally was a leader in getting the industry to plant dwarf apple trees. Memorial contributions to Wally can be made to the IFTA Research Endowment Fund with the announcement of a goal of $250,000 by this time next year when IFTA convenes in Michigan. Almost immediately just shy of $15,000 was raised by the end of the day!

In the PM session "Getting the Right Fruit in the Bin" yours truly talked about "On-Farm Research: Reduce Errors, Get Results" and Cornell's Craig Kahlke (Lake Ontario Fruit Program ) spoke on "The Best Tools for the Job - Measuring Maturity in High Value Apple Varieties." Otherwise, IFTA Business Meeting wherein Lisa Jenereaux (Spurr Brothers Farm LTD, Nova Scotia) and Jeff Cleveringa (Starr Ranch, WA) were elected IFTA Board Chair and Vice-Chair respectively. (You now know where to send complaints!) Plus a "People and Machines to Harvest Apples Panel Discussion" and a nice education sessions wrap-up "Take Home Messages -- Young Professional Panel Discussion" lead by Jen Baugher of Adams County Nursery. Don't forget IFTA is going to Ontario for a Summer Tour (July 21-24, 2019) and the Annual Conference is returning to Grand Rapids, Michigan the week of February 9, 2020.

Thanks Fruit Growers News for the Tweet!

Interesting facts on Titratable Acidity for Honeycrisp, by Cornell's Craig Kalhke
Now for that very special event on Wednesday Evening, the Women's Network Dinner. Mostly because Chelcie Martin, Honey Pot Hill Orchard, Stow, MA and Elly Vaughan, Phoenix Fruit Farm, Belchertown, MA, who were home-state recipients of a scholarship sponsored by the IFTA Women's Network. Both gave five minute stand-up routines during the celebration, and I got to say, they would have made The Marvelous Mrs. Maisel proud! The third recipient, I believe, was Diane Kearns, Fruit Hill Orchard, Winchester, VA.

Chelcie Martin and Elly Vaughan at IFTA Women's Network Dinner
On to last day, Thursday, February 28 - Orchard tours to Wayne County, biggest apple producing County in New York, east of Rochester. AM stops, Fowler Farms and Wafler Farms. All I can say is WOW, especially Fowler Farms who pioneered super-spindle in New York many years ago. Words don't do justice to the panorama of gently sloping hills, almost as far as the eye can see, of young super-spindle orchard. Honeycrisp, SweeTango, Gala, and more recently Evercrisp on M.9 and B.9 rootstocks. Fowlers are vertically integrated and their excellence in apple growing is almost legendary. I particularly liked their use of black locust support system posts, which they have their own sawmill and even grow their own locust to make their posts all on-site. I can't help but think if I was going to do an organic apple orchard in the East, it would look a lot like Fowler's. At Fowler's we also listened to Cornell's Terence Robinson on Helena's proprietary HyGround soil sampling program that "gives detailed information on soil variability and can help target pinpoint areas for nutrient recommendations." Less to say about Wafler's, although their camera-on-platform to monitor orchard field workers was certainly interesting, but a little intimidating and big-brotherish -- who has time to watch all that recorded video? Only Paul Wafler! He claims it's not to punish/reprimand employees, but to help them be better and more efficient workers. Point taken. And out in the orchard, Kyle Wafler talked about logistics of the Tall-Spindle-Tip (Wafler System). The System, along with their self-designed work/harvest orchard platforms -- don't forget, with video camera!!! -- helps keep the flow moving and achieve high apple yields and quality while reducing costs.

Wafler Farms wall-to-wall super-spindle. I particularly liked the black locust posts
and low tree height. Think organic...

Cornell's Terence Robinson talks about variable rate fertilizer application benefits.
Helena's HyGround soil sampling technology. Think precision orcharding...

Kyle Wafler, Wafler Farms, talks Tall-Spindle-Tip (aka Wafler System)
Ben and Tom Clark at Wafler Farms. The orange cone is attached to
Wafler''s harvest platform and is where non-perfect fruit ends up
while being harvested.
In the afternoon, and it did not seem to be getting much warmer, but we visited VanDeWalle Farm, LLC and Cherry Lawn Farms, LLC. At VanDeWalle, the discussion centered around production of high-quality fresh-market apples -- including the new club varieties Sweet Cheeks, SweeTango, and Evercrisp -- using tall-spindle/fruiting wall systems. At Cherry Lawn an intended demo of Drape Net over high-value club varieties went awry (the net had to be removed before our visit) because of record-high winds a few days prior. Humph?

Todd and Ted (or is it Ted and Todd?) Furber, Cherrry Lawn Farms, LLC.
Note the bent-over tree tops where Drape Net was used last growing season.
There was a lot packed into four days of the IFTA Conference in western New York. There are parallels to what everyone is doing out there, from Nova Scotia, to New York, to Ontario, to Michigan, to Washington, to British Coumbia. All places IFTA has held a Conference or Tour recently (Ontario upcoming). Details are in regional, often minor differences and priorities, but standardization on the basics -- tall/super spindle/hi-density with high light utilization, fruiting wall, orchard platforms/mechanization, adopting technology, labor efficiencies, and new varieties -- are common themes to successful apple production across all regions as we move into the 2020's. And finally thanks to all the attendees, speakers, IFTA Directors, Management, Conference Planning Committee, Cornell Extension/Lake Ontario Fruit Team, and all our local hosts. A lot of bang for the buck! And I shout out to Massachusetts tree fruit growers who went and learned at the IFTA Conference -- Mo and Andre Tougas, Tougas Family Farm; Courtney Basil and Tim Smith, Apex Orchards; Chris Smith, C.N. Smith Farm; Ben and Tom Clark, Clarkdale Fruit Farms; Chelcie Martin, Honey Pot Hill Orchard; Elly Vaughan, Phoenix Fruit Farm; and Bill Broderick, Sunny Crest Orchards. 

Cheers at the Hyatt Downtown Hotel bar after a long 5 days...
Been a long time since I had a Genny!