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Healthy Fruit 2011 Vol. 19:9

May 31, 2011

Apple BlossomPowdery MildewObliqueBanded Leaf Roller Pheromone TrapBrown Rot FungusPlum CurculioEnterprise AppleApple FruitletsBrown marmorated stink bug (BMSB) monitoring trap at UMass Cold Spring Orchard.

Current (through May 30) degree day (DD) Accumulations

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

Base 43: 722

Base 50: 455

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

Lesser appleworm 1st flight peak: 355-773

Codling moth 1st flight peak: 574-1008

Obliquebanded leafoller pupae present: 601-821

Obliquebanded leafoller 1st catch: 815-979

European red mite 1st summer eggs: 447-555

Orchard Radar insect synopsis

Note: with each issue of Healthy Fruit we will be reprinting apple insect degree-day model highlights from Glen Koehler's (U. of Maine) Orchard Radar output for Belchertown, MA.

  • Codling moth (CM), 1st generation, first sustained trap catch biofix date: May 16, Monday. 1st generation adult emergence at 40% and 1st generation egg hatch at 0%. 1st generation 3% CM egghatch: June 3, Friday = target date for first spray where multiple sprays needed to control 1st generation CM. 1st generation 20% CM hatch = June 10, Friday = target day where one spray needed to control 1st generation CM.
  • 1st generation obliquebanded leafroller (OBLR) flight begins around: June 6, Monday.
  • Oriental fruit moth (OFM) 1st generation - 55% egg hatch and first treatment date, if needed: May 29, Sunday. 2nd generation OFM flight begins around: June 28, Tuesday. 2nd generation - first treatment date, if needed: July 6, Wednesday.
  • Increased risk of Plum Curculio (PC) damage as McIntosh and similar cultivars increase fruit size: May 20, Friday. Earliest safe date for last PC insecticide spray: May 25, Wednesday.
  • Spotted Tentiform Leafminer (STLM): 1st generation sapfeeding mines start showing: May 21, Saturday. Optimum sample date is around Monday, May 23, when a larger portion of the mines are visible. 2nd STLM flight begins around: June 12, Sunday.
  • Apple sensitivity to post-bloom thinner: Tue. May 31 - Thurs. June 2, Intermediate -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2+ days with high temps. > 75F. Fri. June 3 - Sun. June 5, Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2+ days with high temps. > 75F.

Upcoming meetings

June 14, 15, 16: Tree fruit twilight meeting, TBA

July 18, 2011: Massachusetts Fruit Growers' Association Summer Meeting, Parlee Farms, Tyngsoboro, MA

The way I see it

Enjoy this Special Picture Edition of Healthy Fruit. JC

Useful links

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