Timing Insecticides for Control of OFM/CM
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Transcript of Timing Insecticides for Control of OFM/CM
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
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25
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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
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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