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Healthy Fruit 2009 Vol. 17:11

Jun 16, 2009

Current (through June 15) degree day (DD) accumulations

Location: UMass Cold Spring Orchard (CSO), Belchertown, MA

  • Base 43: NA
  • Base 50: NA

Significant upcoming orchard events based on degree days (Base 43):

  • codling moth first flight peak: 593–1017
  • obliquebanded leafroller 1st catch: 827–939
  • obliquebanded leafroller 1st flight peak: 843–1139
  • dogwood borer 1st catch: 759–1503
  • rose leafhopper adult on apple: 809–1053

The way I see it

Pretty quiet out there and nothing too notable other than the extended period of cool and showery weather. I have seen white apple leafhoppers (WALH, or rose leafhopper?) in a few orchards, and building populations may warrant treatment sooner or later. Neonicotinoid insecticides such as Provado, Actara, Calypso, Clutch, or Assail provide excellent control. Reminds me, keep on the lookout for potato leafhopper (PLH), particularly in young blocks. I expect they will arrive with the next push of warm air from the south if we ever get one. PLH can do a lot of damage in short order if left unchecked. Ditto on the neonics. Also, it's not too early to hand thin apples and peaches. Multiple benefits include enhanced fruit size and quality, better return bloom in apples, and it allows you to be up close and personal with your foliage to look for Insect and disease problems. And don't forget to keep ripening stone fruit (i.e., cherries) covered with fungicide for brown rot. Hope to see you at the tree fruit twilight meetings this week. J. Clements

NEWA Apple Insect Models

What follows are the display outputs for various NEWA Apple Insect Models run on Monday afternoon. Comments that follow are mine. A reminder you can run these models for an airport location closest to you by visiting the NEWA Apple Insect Models website. J. Clements

Codling Moth Results

If you have a habitual problem with codling moth, then follow the advice and continue spray(s). Earlier sprays targeting plum curculio may have had an impact on codling moth populations. Insecticide recommendations for codling moth include: Guthion and Imidan; Delegate, Altacor, or Belt; and Voliam Flexi (unsure of registration status in Massachusetts).

Oriental Fruit Moth Results

We are in a lull for Oriental fruit moth, and earlier control measures should have been successful, including mating disruption and earlier insecticide sprays in peaches and apples for plum curculio.

Obliquebanded Leafroller Results

We are at the beginning of an important control period for OBLR. Orchards with an OBLR population as documented by monitoring should be spraying an insecticide by the end of this month. Best control options include: SpinTor, Intrepid, or Entrust; Proclaim, Delegate, Altacor, Belt, or Voliam Flexi. With most of these insecticides, earlier timing is better than late, and good coverage of the foliage is a must -- spray carefully.

Plum Curculio Results

Plum curculio is DONE in most orchards. While hand thinning, I am picking up some curculio damage where orchards with a light post-bloom insecticide program.

Spotted Tentiform Leafminer Results

No action is recommended now, however, check back to see when NEWA suggests sap feeding mines will appear based on degree days and trap captures. Controlling STLM is an elusive target at best, however, some orchards experience significant populations which can result in pre-harvest fruit drop. You probably know who you are.

Apple Maggot Results

As you can see, no action is necessary. It's interesting to note, however, that we are not that far away from when the first possible emergence of AMF adults based on degree day accumulations. Stay tuned.

J. Clements

Going green at Red Apple Farm

Green talk and 15kW turbine ribbon cutting

Wednesday, June 24, 2009, 3:45 to 7:30 PM (panel talks 4 to 5 PM)

Your hosts: the Rose Family, at Red Apple Farm, 455 Highland Ave., Phillipston, MA

Pre-Register today: 508-755-7400 ext. 229
to Monica Elefterion -

4:00 pm: Panel discussion & Q & A on sustainable and renewable energy by:

  • -MA Tech Collaborative
  • -Johnathan Hyde, Green Tourism, Mass. Office of Travel and Tourism
  • -Gerald Palano, Alternative Energy Specialist, MA Dept of Agriculture

6:15 p.m.: Ribbon Cutting on 15kW Wind Turbine

Followed by:
FREE "Business After Hours" reception hosted by

Enjoy a local "Taste of Local Tourism": complimentary tastes and drinks from local vendors with a green commitment!

Timely and updated fact sheets available on the UMass Fruit Advisor website

F-129R--2009 Late Season "Rescue" Thinning with Ethephon

Summary recommendation for "rescue" thinning with ethephon:

  • Treat when temperatures are 70-80 F (day of treatment + 2 days).
  • Do not treat when below 70 F or above 80 F (day of treatment + 2 days)
  • Fruit 15-25 mm diameter (0.8-1 inch)
  • McIntosh and Macoun 200-300 ppm (0.7 - 1 pint Ethrel per 100 gallons dilute spray, with 0.5 lbs carbaryl a.i. and a surfactant)
  • See the fact sheet noted above for more precautions and details

F-131--2007 Enhancing Return Bloom on Apple with Plant Growth Regulators

Summary recommendation for enhancing return bloom with ethephon

  • Begin 4 to 6 weeks after full bloom and after 'June drop'
  • Use Ethrel at 0.5 pint per 100 gallons dilute spray -- can be combined with cover sprays
  • Make 2 to 3 weekly applications depending on variety (1-2 on early maturing cultivars)
  • Avoid applying at high temperatures and/or too early as ethephon can cause significant fruit thinning under the right conditions
  • See the fact sheet noted above for more precautions and details