Timing Insecticides for Control of OFM/CM Deborah Breth CCE-LOF

Timing Counts Consider target life stage… –eggs, or hatching larvae? Use Degree-day models to determine when the life stage is present and how long Start the degree-day model with “biofix” – –1 st sustained trap catch

When is the first spray for CM recommended? 1.First moth flight 2.First cover DD base 50F

Codling Moth Biology Bloom Codling Moth egg laying hatch egg laying hatch 1 st Flight Mid-bloom Overwinter under loose bark and debris 1 st egg hatch at DD50F P.McGhee - MSU

Degree-Day calculations 1) Max + Min temp – base temp = daily DD total 2 Start Biofix + Accumulate daily DD = Current DD 2) NEWA – re/newa/ enter start date (biofix) and end date, and base temperature, and select weather station location

NEW NEWA calculator for beta testing waModel/apple_pesthttp://newa.nrcc.cornell.edu/ne waModel/apple_pest

New NEWA Apple Insect Models

Codling Moth Timing Model MSU model - PETE Set biofix of first sustained seasonal flight with pheromone traps Calculate accumulated DD50/88F First egg hatch is DD 50F 1st spray scheduled for 1 st egg hatch + a 2 nd spray days later 2nd generation of egg hatch – 1250 DD + a 2 nd spray days later.

NYFVI project Looked at modification of PETE model with focus on seasonal trap data Using a recommended trap threshold of 5 moths per trap per week – If <7 moths per trap per week, extend insecticide residue DD after high trap catch through day period – 1 spray If >7 moths per trap per week – 2 sprays

CM Spray Timings PETE Modified- PETE Green curves represent egg hatch predictions.

CM Spray Timings PETE Modified- PETE

CM Spray Timings PETE Modified- PETE

CM Model modifications Need to include trap information throughout season –Note B peak that will extend egg hatch of first generation Under moderate populations – MSU PETE is adequate High populations – there is no spray gap Low populations – will overtreat for CM –focus on control of other pests.

OFM Degree day model – base temperature of 45F Mid-Atlantic Orchard Monitoring Guide

Insecticide Timing for OFM Control F6 days after 1st peak flight Fwithin 3 days of the 2nd peak flight or within 6 days of sharp trap count increase for 2nd peak F10 days after 2nd generation spray if high population continues Fwithin 3 days of 3rd peak Fsuggested threshold of 6-8 moths per trap per week

Summary Trapping Counts ! Are orchards high, moderate, or low pressure Set biofix for separate generations Add DD base 50F for CM days Add DD base 45F for OFM days NEWA and Fruit FAX?

When is the first spray for CM recommended? 1.First moth flight 2.First cover DD base 50F