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 September 20, 2011 | |
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| Borers - Roundheaded Appletree Borer (RAB) & Dogwood Borer | |
| RAB egglaying begins: June 8. Peak egglaying period roughly: June 29 to July 12. | |
| First RAB eggs hatch roughly: June 23. Peak hatch roughly: July 14 to August 1. | |
| First Dogwood borer egg hatch roughly: June 28. Peak hatch roughly: August 1. | |
| 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
10, Friday, = 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
18, Saturday, = target date where one spray needed to control 1st generation CM. |
|
| 2nd
generation 7% CM egg hatch: July
30, Saturday, = 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
8, Monday, = target date where one spray needed to control 2nd generation CM. |
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| Lesser Appleworm LAW | |
| 1st LAW flight begins around: May 19, Thursday. Peak trap catch: May 27. | |
| 2nd LAW flight begins around: July 13, Wednesday. | |
| Mullein Plant Bug MPB | |
| The
expected 50% egg hatch date is: May
21, Saturday, which is 5 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 26, Thursday. |
|
| Obliquebanded Leafroller OBLR | |
| 1st generation OBLR flight begins around: June 11, Saturday. | |
| 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 28, 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 6, Wednesday If first OBLR late instar larvae sample is below threshold, date for confirmation follow-up: July 10, Sunday. |
|
| Oriental Fruit Moth OFM | |
1st generation OFM flight starts: May 3, Tuesday. 1st generation 55% egg hatch and first treatment date, if needed: May 31, Tuesday. |
|
| 2nd
generation OFM flight begins around:
July 2, Saturday. 2nd generation - first treatment date, if needed: July 9, Saturday. 2nd generation - second treatment date, if needed: July 19, Tuesday. |
|
| Plum Curculio PC | |
| Increased risk of PC damage as McIntosh and
similar cultivars increase fruit size: May 27, Friday. |
|
| Earliest safe date for last PC insecticide spray: June 10, Friday. | |
| 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, July 1. | |
| Redbanded Leafroller RBLR | |
| 1st
RBLR flight begins around April 19,
Tuesday. Peak trap catch and approximate start of egg hatch: May 6, Friday. |
|
| 2nd
RBLR flight begins around July 3,
Sunday. Peak catch and approximate start of egg hatch: July 15. |
|
| San Jose Scale SJS | |
| First
adult SJS caught on trap: May 26, Thursday. 1st generation SJS crawlers appear: June 22, Wednesday. |
|
| Spotted Tentiform Leafminer
STLM (and presumably apple blotch leafminer) |
|
| 1st STLM flight, peak trap catch: May 13, Friday. | |
| 1st generation sapfeeding mines start showing: May 28,
Saturday. Optimum sample date is around Sunday, May 29, when a larger portion of the mines are visible. |
|
| 2nd STLM flight begins around: June 20, Monday. | |
| Rough guess of when 2nd generation sap-feeding mines begin showing: July 8, Friday. | |
| Optimum
first sample date for 2nd generation STLM sapfeeding mines is July 15, Friday. |
|
| Second
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 20, Wednesday. |
|
| Third
optimized sample date for 2nd generation STLM sapfeeding mines, if needed:
July 30, Saturday. |
|
| Tarnished Plant Bug TPB | |
| Rough guess of when TPB begin showing on traps: April 18, Monday. | |
| Rough
guess of when TPB damage results in deformed fruit at harvest instead of aborted bud: April 29, Friday. |
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| White Apple Leafhopper WAL | |
| 1st generation WAL found on apple foliage: May 20, Friday. | |
| 2nd generation WAL found on apple foliage: August 7, 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. |