IPM News  -- June 22, 2000

L.P.Berkett, IPM Specialist

An IPM Checklist for Vermont

As previously indicated, each issue of the Vermont Apple Newsletter will contain parts of  the IPM  Checklist  that Dr. Elena Garcia and I developed through a USDA project entitled:  "Linking Food Safety to Farm*A*Sys and IPM to Reduce Microbial and Pesticide Risks in Apples.   The checklist is intended to be a quick reminder; details can be found in other  parts of this newsletter or in other  available resources.


  • Check sprayer calibration and adjust for summer applications.

  • Be aware of any restrictions on pesticides used during this period and their 'Pre-Harvest Intervals'.

  • In blocks were Codling Moths are a problem, determine if 1260-1370 DD (base 50F) have accumulated from first trap capture in pheromone traps since this is  the most effective time for management of second generation. 

  • Check for second generation sap-feeding larval mines in leaves to determine if Leafminer threshold has been reached.

  • Examine middle-age terminal leaves to determine if threshold has been reached for European Red Mites.

  • Check Apple Maggot Fly traps on a regular basis to determine if threshold has been reached.  Clean traps and replace lure every 3-4 weeks.

  • In late July, examine leaves for presence of second generation Leafhopper nymphs and adults to determine if threshold has been reached.

  • Continue to keep track of the total number of hours, starting ten days past Petal Fall,  that the leaves were wet.  Risk of Fly Speck infection increases when 270 hours of wetting have accumulated.

  • Begin summer pruning in mid- to late-July to open up the canopy, improving  light penetration for better fruit quality, faster drying conditions, and better spray coverage. 

  • Mow grass as often as possible to discourage Vole populations and to aid in air circulation for disease management. Keep an 18-inch weed free area next to trees.

  • Monitor soil moisture conditions and irrigate when necessary. 

  • Collect leaves for foliar nutrient analysis in late July to early August.  Contact your Extension office for specific instructions.  Next year's fertilizer program should be based on the foliar and soil analysis.

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