Apple insect pest degree day models
| Background Information for this page | |
| Return to radar list for Greenville RI | |
| Weather data for Greenville RI. Forecast values begin September 20, 2011 | |
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| Borers - Roundheaded Appletree Borer (RAB) & Dogwood Borer | |
| RAB egglaying begins: June 2. Peak egglaying period roughly: June 24 to July 7. | |
| First RAB eggs hatch roughly: June 17. Peak hatch roughly: July 9 to July 27. | |
| First Dogwood borer egg hatch roughly: June 20. Peak hatch roughly: July 27. | |
| Codling Moth (CM) | |
| Codling
moth development as of September 20:
2nd generation egg hatch is completed. Key codling moth managment dates shown below: |
|
| 1st
generation 3% CM egg hatch: June
4, Saturday, = target date for first spray where multiple sprays needed to control 1st generation CM. See Codling moth tables for follow-up spray dates to maintain protection through 1st generation CM egg hatch. |
|
| 1st
generation 20% CM egg hatch: June
10, Friday, = target date where one spray needed to control 1st generation CM. |
|
| 2nd
generation 7% CM egg hatch: July
24, Sunday, = target date for first spray where multiple sprays needed to control 2nd generation CM. If needed and allowed by preharvest interval, see the August Codling Moth table for follow-up spray dates. |
|
| 2nd
generation 30% CM egg hatch: August
2, Tuesday, = target date where one spray needed to control 2nd generation CM. |
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| Lesser Appleworm LAW | |
| 1st LAW flight begins around: May 9, Monday. Peak trap catch: May 20. | |
| 2nd LAW flight begins around: July 7, Thursday. | |
| Mullein Plant Bug MPB | |
| The
expected 50% egg hatch date is: May
12, Thursday, which is 7 days before rough estimate of Red Delicious petal fall date. |
|
| Most
accurate time for limb tapping counts, or treatment if needed, but possibly after some MPB damage has occurred, is 90% egg hatch date: May 19, Thursday. |
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| Obliquebanded Leafroller OBLR | |
| 1st generation OBLR flight begins around: June 5, Sunday. | |
| Where
waiting to sample late instar OBLR larvae is not an option (= where OBLR is known to be a problem, and will be managed with insecticide against young larvae): |
|
| Early
egg hatch and optimum date for initial application of B.t., Delegate,
Proclaim, Intrepid, Rimon, Altacor, Belt, pyrethroid or other insecticide
effective against OBLR (with follow-up applications as needed): June 21, Tuesday. |
|
| Where
waiting to sample late instar OBLR larvae to determine need for
treatment is an option, or to check on results from earlier sprays: |
|
| Optimum
sample date for late instar summer generation OBLR larvae: July 1, Friday If first OBLR late instar larvae sample is below threshold, date for confirmation follow-up: July 4, Monday. |
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| Oriental Fruit Moth OFM | |
1st generation OFM flight starts: April 28, Thursday. 1st generation 55% egg hatch and first treatment date, if needed: May 28, Saturday. |
|
| 2nd
generation OFM flight begins around:
June 26, Sunday. 2nd generation - first treatment date, if needed: July 3, Sunday. 2nd generation - second treatment date, if needed: July 13, Wednesday. |
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| Plum Curculio PC | |
| Increased risk of PC damage as McIntosh and
similar cultivars increase fruit size: May 20, Friday. |
|
| Earliest safe date for last PC insecticide spray: May 26, Thursday. | |
| Plum curculio spray intervals | |
| If relying on repellance by Surround instead of PC mortality by insecticide, Surround coverage should be maintained until PC egglaying begins to naturally decline around Friday, June 24. | |
| Redbanded Leafroller RBLR | |
| 1st
RBLR flight begins around April 12,
Tuesday. Peak trap catch and approximate start of egg hatch: April 29, Friday. |
|
| 2nd
RBLR flight begins around June 27,
Monday. Peak catch and approximate start of egg hatch: July 9. |
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| San Jose Scale SJS | |
| First
adult SJS caught on trap: May 18, Wednesday. 1st generation SJS crawlers appear: June 15, Wednesday. |
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| Spotted Tentiform Leafminer
STLM (and presumably apple blotch leafminer) |
|
| 1st STLM flight, peak trap catch: May 6, Friday. | |
| 1st generation sapfeeding mines start showing: May 18,
Wednesday. Optimum sample date is around Friday, May 20, when a larger portion of the mines are visible. |
|
| 2nd STLM flight begins around: June 12, Sunday. | |
| Rough guess of when 2nd generation sap-feeding mines begin showing: July 2, Saturday. | |
| Optimum
first sample date for 2nd generation STLM sapfeeding mines is July 8, Friday. |
|
| Second
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 14, Thursday. |
|
| Third
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 23, Saturday. |
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| Tarnished Plant Bug TPB | |
| Rough guess of when TPB begin showing on traps: April 17, Sunday. | |
| Rough
guess of when TPB damage results in deformed fruit at harvest instead of aborted bud: April 26, Tuesday. |
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| White Apple Leafhopper WAL | |
| 1st generation WAL found on apple foliage: May 10, Tuesday. | |
| 2nd generation WAL found on apple foliage: July 31, Sunday. | |
| *
Rose leafhopper is easily confused with WAL but has different generation
dates. Rose leafhoppers typically immigrate into orchards from border row host plants between 1st and 2nd generation WAL. |