WNC Orchard Insect Pest Populations – May 31, 2022

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High-density apple orchardCodling moth degree-day accumulations range from about 550 in Henderson County to 755 in Cleveland County, which equates to completion of about 30% and 60% first generation egg hatch. First generation codling moth can continue to be a threat through about 900 DD after biofix, so the next two weeks is an important time for management in Henderson County and at similar or higher elevations. In lower elevation orchards such as Cleveland County, first generation egg hatch will be nearly complete in the next week. In the absence of pheromone trapping, one should assume a threat exists.

Tufted apple bud moth DD accumulations range from 740 in Henderson County to 967 in Cleveland County. Excellent control can be achieved with a single insecticide application made any time between 800 and 1200 DD. Hence, we are essentially in that window of opportunity now. Insecticides recommended for codling moth are also effective against TABM, with Altacor, Exirel, Verdepryn, Delegate and Intrepid most effective.


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


2022 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
May 16 May 23 May 31
Codling moth  2.0 1.0 0.5
Oriental fruit moth 3.0 4.5 3.5
Tufted apple bud moth 18.0 42.0 24.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 6.0 4.0
Lesser appleworm 10.0 5.0 0.0
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.0 1.0 0.5
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 38.0 80.0 82.0
Peachtree borer 0.0 0.0 2.0
Lesser peachtree borer 18.0 28.0 9.0
San Jose scale 0.0 0.0 0.0
Ambrosia beetle (all species) 2.0 6.3 .

*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.


2022 Accumulated Degree Days

HENDERSON COUNTY
May 16 May 23 May 31
Codling moth (Biofix: April 22) 296 429 555
Oriental fruit moth (Biofix: April 12) 519 686 852
Tufted apple bud moth (Biofix: April 27) 321 488 655

About degree-day models


2022 Pest Trends (click to enlarge)

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