Timing Insecticides for Control of OFM/CM

Deborah BrethCCE-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” ––1st sustained trap catch

When is the first spray for CM recommended?

1 2 3

33% 33%33%1. First moth flight

2. First cover3. 220-250 DD

base 50F

Codling Moth Biology

Bloom

Codling Moth

egglaying hatch

egglaying hatch

1st Flight Mid-bloomOverwinter under loose

bark and debris

1st egg hatch at 220-250 DD50F

P.McGhee - P.McGhee - MSUMSU

Degree-Day calculations1) Max + Min temp – base temp = daily DD total 2 Start Biofix + Accumulate daily DD = Current

DD

2) NEWA –http://www.nysaes.cornell.edu/ipm/specware/newa/ enter start date (biofix) and end date, and base temperature, and select weather station location

NEW NEWA calculator for beta testing- 2009

• http://newa.nrcc.cornell.edu/newaModel/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 220-250 DD 50F• 1st spray scheduled for 1st egg hatch +

a 2nd spray 10-14 days later• 2nd generation of egg hatch – 1250 DD

+ a 2nd spray 10-14 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 200-250 DD after high trap catch through 10-14 day period – 1 spray

• If >7 moths per trap per week – 2 sprays

CM Spray Timings

High pressure - CM Trap Counts - 2007

0

5

10

15

20

25

30

35

40

Mot

hs p

er T

rap

CM Lake Rd

CM Threshold

PETE

Modified-PETE

Green curves represent egg hatch predictions.

CM Spray TimingsPETE

Modified-PETE

Moderate Pressure - CM Trap Counts - 2007

0

2

4

6

8

10

12

14

Mot

hs p

er T

rap

CM Old Ridge Rd

CM Threshold

Low Pressure - CMTrap Counts - 2007

0

1

2

3

4

5

6

7

Mot

hs p

er T

rap

CM

CM Threshold

CM Spray TimingsPETE

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

6 days after 1st peak flight within 3 days of the 2nd peak flight or

within 6 days of sharp trap count increase for 2nd peak

10 days after 2nd generation spray if high population continues

within 3 days of 3rd peak suggested 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 200-250 DD base 50F for CM +

10-14 days• Add 170-200 DD base 45F for OFM +

10-14 days• NEWA and Fruit FAX?

When is the first spray for CM recommended?

1 2 3

0%

100%

0%

1. First moth flight

2. First cover3. 220-250 DD

base 50F