WNC Orchard Insect Pest Populations – September 21, 2020

— Written By and last updated by

Pond in apple orchard

The last full pest report was September 8, but traps will continue to be checked and the numbers updated until insect populations approach zero. Most pests are continuing to decline in number.

The full September 8 pest report can be seen on our website. All previous 2020 pest reports can be found by scrolling down this page.


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


2020 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Sep 7 Sep 14 Sep 21
Codling moth  0.0 0.1 0.0
Oriental fruit moth 2.6 4.4 1.8
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 0.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 2.0 1.3 0.3
Brown marmorated stink bug (commercial) 7.3 4.3 1.7
Brown marmorated stink bug (unsprayed) 31.8 32.3 12.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 13.0 12.0 2.0
Peachtree borer 14.0 22.0 5.0
Lesser peachtree borer 33.0 29.0 3.0
San Jose scale 35.0 7.5 20.0

*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.


2020 Accumulated Degree Days

HENDERSON COUNTY
Sep 7 Sep 14 Sep 21
Codling moth (Biofix 4/20) 2567 DD 2713 DD 2806 DD
Oriental fruit moth (Biofix 3/30) 3417 DD 3598 DD 3725 DD
Tufted apple bud moth (Biofix 4/27) 3159 DD 3340 DD 3467 DD

About degree-day models


2020 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