WNC Orchard Insect Pest Populations – April 20, 2021

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April 20, 2021

Oriental fruit moths in trapCool Weather Will Suppress Insect Activity

Last week’s pest update provided options for insecticide applications at petal fall, emphasizing the importance of plum curculio control at this time, as well as oriental fruit moth in those orchards not using mating disruption. Highs for the remainder of this week are predicted to be in the 50s and 60s, and temperatures will not return to the 70s until next Monday. If petal fall insecticide sprays have not yet been applied, it would be advantageous to wait until early next week when pest activity again picks up to make applications.

Our codling moth biofix date for Henderson County was 10 April, and in Cleveland County it was estimated at 6 April. Hence, we are still at least 10 to 14 days and possibly longer before anticipated first sprays for first-generation codling moth.


Learn more about southeastern apple insect pests at the Apple Insect Management page.


2021 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Apr 5 Apr 12 Apr 19
Codling moth  0.0 2.0 7.5
Oriental fruit moth 12.0 50.0 20.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 9.0 7.0 14.0
Obliquebanded leafroller
Lesser appleworm
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.0 0.0 0.0
Spotted tentiform leafminer 4.0 0.0 0.0
Dogwood borer 0.0 0.0 0.0
Peachtree borer 0.0 0.0 0.0
Lesser peachtree borer 0.0 1.0 3.0
San Jose scale 0.0 0.0 0.0

*Note that these averages illustrate only the timing of insect emergence and fluctuations in populations, and are not representative of population levels in any given orchard. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.


2021 Accumulated Degree Days

HENDERSON COUNTY
Apr 5 Apr 12 Apr 19
Codling moth (Biofix: April 10)
46 67
Oriental fruit moth (Biofix: March 27)
56 152 216
Tufted apple bud moth (Biofix has not been established)

About degree-day models


2021 Pest Trends (click to enlarge)

Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends Graph showing insect population trends


Visit WNC Orchard Insect Populations for archived posts.


Additional Resources