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Apple Thinning Suggestions for 2018

May 21, 2018

Options for the Petal Fall Spray

 

  • First, calculate your TRV. You need to know how much product your trees will need.

 

  • Check out the handout that was distributed during the meeting, titled Spray Mixing Instructions Considering Tree Row Volume.

 

  • Read the our TRV article posted to the Cornell ENYCHP website here:

 

  • Carbaryl - it is a mild thinner and it will hardly over-thin (except Cortland). Be sure you have all bees out before spraying Carbaryl.

 

  • Amid-Thin- This is a mild thinner that can be used at bloom and petal fall.  It should be used at the highest label rate suggested, 8 oz/100 gal TRV dilute. A surfactant could be included in the tank.

 

  • NAA- When more aggressive thinning is required, NAA is frequently the thinner selected. It is not so aggressive at petal fall as compared with when it is applied at the 7 to 14 mm fruit size stage.  During bloom and petal fall it can generally be safely used at a rate of 10 ppm without over thinning.   Add 1 pt Sevin (TRV dilute) for harder to thin cultivars.

 

  • Maxcel at 100ppm (64oz/100gal TRV dilute) + 1 pt Sevin (TRV dilute) is a good option for Gala to get some sizing.

When fruit-set is clear, and if heavy on hard-to-thin varieties such as Gala or on biennial bearing varieties such as Honeycrisp, Macoun and Golden Delicious we are recommending to use 7.5 to 10 ppm NAA plus 1pt Carbaryl /100 gallons TRV dilute at petal fall.

 

Thinning Recommendations for the Petal fall and 8-12 mm spray (when indicated) in 2018:

Varieties where we like Maxcel + Sevin

 

·        Gala - Promalin at Pink to Full Bloom of the King flower, 64 oz Maxcel (100ppm BA) /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute at Petal and again 8-12mm size. You can also use 7.5ppm NAA + 1pt Sevin/100 gal TRV dilute at petal fall and come back at 8-12mm size with the Maxcel option.

 

  • Empire - 48 oz Maxcel (75 ppm BA) /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute (petal fall and 8-12mm size).

·        Jonamac - 48 oz Maxcel (75 ppm BA) /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute

 

·        Macoun - It has to have a petal fall spray to stimulate return bloom (7.5ppm NAA plus 1 pint Sevin/100 gallons TRV dilute). At 8-12mm use 48 oz Maxcel (75 ppm BA)  /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute

 

·        Fuji - Bloom 4 ounces NAA (10ppm) /100 Gallons TRV Dilute, then 48-64 oz Maxcel  (75-100 ppm BA) /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute (petal fall and 8-10mm)

 

·        Red Delicious - 48 oz Maxcel (75 ppm BA) /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute. Do not use NAA because of pygmy fruit formation. A dose of 1pt Sevin/100 gal TRV dilute would work if fruit set is low and you want to break clusters.

 

·        We like the 1 pint of Promalin at full bloom, you get some fruit typiness but furthermore you get some thinning.

Varieties where NAA works well

 

·        McIntosh - respond well to both Maxcel and NAA. So, 2oz Fruitone L or Pomaxa (5ppm NAA)/100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute will work great. AceyMac thins harder than the true Macs - 7.5ppm NAA + 1pt Sevin.

 

·        Honeycrisp - mature Honeycrisps are hard to thin because of the vigor level of the tree - less competition. Use 3oz Fruitone L or Pomaxa (7.5ppm NAA)/100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute. Put 10ppm NAA at bloom and 7.5ppm NAA + carbaryl at PF and again at 8-12mm. It will help flower initiation.

 

·        Cortland - It doesn't like carbaryl and it thins very easy, so use 2oz Fruitone L or Pomaxa (5ppm NAA)/100 gal TRV dilute at 8-12 mm size.

 

·        Gingergold - 1oz Fruitone L or Pomaxa (2.5ppm NAA)/100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute at 8-12 mm size

 

·        NY1 and NY2- according to our 3rd year trial both varieties are responding well to either BA or NAA (Maxcel is preferable due fruit size): 64 oz Maxcel /100 gallons TRV dilute + 1pt Sevin/100 gal TRV dilute OR 3oz Fruitone L or Pomaxa/100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute (petal fall and 8-10mm). NY2 can be biennial if over-cropped.

 

·        Golden Delicious - If you use Provide to control russeting at petal fall, then Golden thins easier and 10ppm of NAA (4oz Fruitone L or Pomaxa /100 gal TRV dilute) + 1pt Sevin/100 gal TRV dilute is ok, otherwise put 15ppm NAA on. Maxcel works OK on golden, but it is the toughest variety for Maxcel to thin well - 64oz.

 

·        Rome Beauty -5ppm NAA (2oz Fruitone L or Pomaxa /100 gal TRV dilute) + 1pt Sevin/100 gal TRV dilute (spur type use 7.5ppm NAA) - 8-12mm.

 

·        Northern Spy - it is a biennial, and it needs a bloom or petal fall with 2oz Fruitone L or Pomaxa (5ppm)/100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute.

 

·        Idared: It thins very easily. Use 2.5ppm NAA (1oz Fruitone L or Pomaxa /100 gal TRV dilute) + 1pt Sevin/100 gal TRV dilute at 8-12mm.

 

·        Jonagold: use moderate rates 7.5ppm NAA (3oz Fruitone L or Pomaxa /100 gal TRV dilute + 1pt Sevin/100 gal TRV dilute) at 12-14mm - one time.

 

·        Pink Lady: it thins very easy. Use 2.5 to 5ppm NAA (1oz to 2oz Fruitone L or Pomaxa /100 gal TRV dilute) + 1pt Sevin/100 gal TRV dilute at 8-12mm.

 

Thinning Without Carbaryl

  • Use the same rates at petal fall and 10-12mm

 

  • As a rule of thumb 7.5ppm NAA can replace 1pt carbaryl in moderate to hard-to-thin varieties. However, this does not apply for varieties such as Fuji and Red Delicious as pygmy fruit may result.

 

  • HC - 32oz Maxcel + 3oz Fruitone L/100 gal TRV dilute

 

  • Gala -  64oz Maxcel + 3oz Fruitone L /100 gal TRV dilute

 

  • Empire - 48oz Maxcel + 3oz Fruitone L/100 gal TRV dilute

 

  • Macoun - 3 oz Fruitone L (7.5ppm NAA) + 48oz Maxcel /100 gal TRV dilute

 

  • Golden Delicious - 3 oz Fruitone L (7.5ppm NAA) + 48oz Maxcel /100 gal TRV dilute, or a long time program used in NJ for Goldens is at 8-12MM use ˝ pint of Ethephon /100 gal TRV dilute plus 4 ounces of NAA (10PPM NAA) /100 gal TRV dilute

 

  • Jonagold - 3oz fruitone + 32 oz Maxcel/100 gal TRV dilute

 

  • NY1 and NY2 = 64oz Maxcel + 3oz Fruitone L /100 gal TRV dilute

 

  • Red Delicious and Fuji - start with a petal fall spray using 8oz Amid Thin//100 gal TRV dilute. Then two shots of 48-64oz Maxcel alone - one at petal fall and another one right after at 8-10mm for Red Delicious and Fuji.

 

  • It might be good to use 10ppm NAA/100 gal TRV dilute at bloom on Fuji, but we do not have any data to support. 


  • Amid Thin at 8oz/100 TRV dilute is a good option for bloom and petal fall for all varieties, including Fuji and Red Delicious as it's not known to cause pygmy fruit.

 

Chemical thinning program for Young Trees:

• For newly planted trees where you desire to totally eliminate the crop try a high rate of Maxcel (64 ounces) + Sevin (2pts) + Oil (1pt) /100 gallon TRV dilute when fruit size is 8-10mm. Or , as soon as the bees are out, begin repeated heavy doses of carbaryl (2 pints/100 gallons) tank-mixed with Regulaid (1 pint/100 gallons).

• For 2nd year trees where we want a small crop use only hand thinning and the Cornell young tree thinning guide to adjust crop load. 

• For 3rd year trees use Sevin alone + follow-up hand-thinning.

• For 4th year trees use 1/2 of our suggested full rate of NAA + Sevin or Maxce l+ Sevin.

• For 5th year trees use 75% of a full rate of NAA + Sevin or Maxcel + Sevin.

• For 6th year trees use a full rate of NAA + Sevin or Maxcel + Sevin.

Cautions

• We suggest that Captan not be added to or near thinning sprays.



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Upcoming Events

2021 Spring Turn-Out Grazier Meeting

April 29, 2021

2021 Spring Turn-Out Grazier Meeting: Adapting livestock, Pasture Forbs, Spending Money. Presented by Cornell Cooperative Extension Educators: Ashely Pierce, Dayton Maxwell, and Aaron Gabriel.

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U-Pick Farm Practices During Covid-19 Pandemic

U-Pick is a critical direct marketing approach for many of our farms and provides
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https://rvpadmin.cce.cornell.edu/uploads/doc_864.pdf

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There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

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Podcasts

Allium Leafminer (ALM) Update

April 8, 2021
Allium leafminer (ALM), a relatively new invasive species in the region, can cause devastating losses to scallions and leeks. Teresa Rusinek and Ethan Grundberg discuss their research to identify effective management strategies for the pest with host Crystal Stewart-Courtens.


Northeast SARE Progress Report: https://projects.sare.org/project-reports/one19-336/

Details the findings from Rusinek and Grundberg’s research to evaluate row cover and insect netting compared to two applications of Entrust and M-Pede to manage ALM.

University of Massachusetts 2020 Pests of the Year ALM Presentation: https://www.youtube.com/watch?v=IadfeJ1dWVo for the recording and https://cornell.box.com/s/wbtigjuuc82ufktu1ghfb0b2dh166mk5 for the slides in PDF

ALM Lookalikes and Visual Lifecycle PDF: https://cornell.box.com/s/q2rdq3vuih5xzoy8dwfu63mm5q980drn

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