Apple insect pest degree day models
| Background Information for this page | |
| Return to radar list for Middletown RI | |
| Weather data for Middletown RI. Forecast values begin May 23, 2012 | |
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| Borers - Roundheaded Appletree Borer (RAB) & Dogwood Borer | |
| RAB egglaying begins: May 28. Peak egglaying period roughly: June 18 to July 3. | |
| First RAB eggs hatch roughly: June 12. Peak hatch roughly: July 3 to July 23. | |
| First Dogwood borer egg hatch roughly: June 16. Peak hatch roughly: July 22. | |
| Codling Moth (CM) | |
| 1st
generation, first sustained trap catch biofix date: May 9, Wednesday Codling moth development as of May 23: 1st generation adult emergence at 19% and 1st generation egg hatch at 0% In most orchards, insecticide targetted against plum curculio and apple maggot prevent codling moth damage. If targetted codling moth control is needed, key management dates are shown below: |
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| 1st
generation 3% CM egg hatch: May
30, Wednesday, = 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. |
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| 1st
generation 20% CM egg hatch: June
6, Wednesday, = target date where one spray needed to control 1st generation CM. |
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| 2nd
generation 7% CM egg hatch: July
22, 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. |
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| 2nd
generation 30% CM egg hatch: July
31, 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 2, Wednesday. Peak trap catch: May 14. | |
| 2nd LAW flight begins around: July 3, Tuesday. | |
| Mullein Plant Bug MPB | |
| The
expected 50% egg hatch date is: May
7, Monday, which is 6 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 13, Sunday. |
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| Obliquebanded Leafroller OBLR | |
| 1st generation OBLR flight begins around: May 30, Wednesday. | |
| 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 16, Saturday. |
|
| 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: June 25, Monday If first OBLR late instar larvae sample is below threshold, date for confirmation follow-up: June 29, Friday. |
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| Oriental Fruit Moth OFM | |
1st generation OFM flight starts: April 16, Monday. 1st generation 55% egg hatch and first treatment date, if needed: May 22, Tuesday. |
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| 2nd
generation OFM flight begins around:
June 21, Thursday. 2nd generation - first treatment date, if needed: June 29, Friday. 2nd generation - second treatment date, if needed: July 10, Tuesday. |
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| Plum Curculio PC | |
| Increased risk of PC damage as McIntosh and
similar cultivars increase fruit size: May 13, Sunday. |
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| Earliest safe date for last PC insecticide spray: May 20, Sunday. | |
| 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 Tuesday, June 19. | |
| Redbanded Leafroller RBLR | |
| 1st
RBLR flight begins around March 30,
Friday. Peak trap catch and approximate start of egg hatch: April 17, Tuesday. |
|
| 2nd
RBLR flight begins around June 22,
Friday. Peak catch and approximate start of egg hatch: July 5. |
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| San Jose Scale SJS | |
| First
adult SJS caught on trap: May 12, Saturday. 1st generation SJS crawlers appear: June 10, Sunday. |
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| Spotted Tentiform Leafminer
STLM (and presumably apple blotch leafminer) |
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| 1st STLM flight, peak trap catch: April 25, Wednesday. | |
| 1st generation sapfeeding mines start showing: May 13,
Sunday. Optimum sample date is around Monday, May 14, when a larger portion of the mines are visible. |
|
| 2nd STLM flight begins around: June 7, Thursday. | |
| Rough guess of when 2nd generation sap-feeding mines begin showing: June 27, Wednesday. | |
| Optimum
first sample date for 2nd generation STLM sapfeeding mines is July 4, Wednesday. |
|
| Second
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 10, Tuesday. |
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| Third
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 21, Saturday. |
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| Tarnished Plant Bug TPB | |
| Rough guess of when TPB begin showing on traps: April 9, Monday. | |
| Rough
guess of when TPB damage results in deformed fruit at harvest instead of aborted bud: April 13, Friday. |
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| White Apple Leafhopper WAL | |
| 1st generation WAL found on apple foliage: May 5, Saturday. | |
| 2nd generation WAL found on apple foliage: July 29, 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. |