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.
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