WNC Orchard Insect Pest Populations – May 24, 2022

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Insect trap in apple orchardCodling moth remains the key insect of concern at this time. Egg hatch degree-day (DD) model accumulations range from about 440 DD in Henderson County to 600 in Cleveland County. While first-generation codling moth can potentially be a concern up until 800 to 1000 DD, depending on population density, the most critical period for protection is typically between about 300 to 800 DD. Rain, cool nights and moderate daytime temperatures over the next 4 to 5 days will likely suppress moth activity.

Tufted Apple Bud Moth (TABM): In lower elevation orchards (<1000 ft) we are approaching the wide window of opportunity for tufted apple bud moth control. Control of this leafroller is easily achieved with one application of a recommended insecticide anytime between 800 and 1200 DD after biofix. DD accumulations range from about 590 in Henderson County to 800 in Cleveland County. In lower elevation orchards control of this generation can be achieved with an application anytime between now and the first week of June. In Henderson County, where TABM populations are generally the highest in this region, the window for control is expected to be during the first two weeks of June. For those monitoring TABM activity, it is important to remember that egg laying does not begin until pheromone trap captures peak, so do not be concerned about high trap captures at this time.


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


2022 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
May 9 May 16 May 23
Codling moth  4.0 2.0 1.0
Oriental fruit moth 9.0 3.0 4.5
Tufted apple bud moth 16.0 18.0 42.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 6.0
Lesser appleworm 10.0 5.0
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.0 0.0 1.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 7.0 38.0 80.0
Peachtree borer 0.0 0.0 0.0
Lesser peachtree borer 33.0 18.0 28.0
San Jose scale 0.0 0.0 0.0
Ambrosia beetle (all species) 1.3 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 9 May 16 May 23
Codling moth (Biofix: April 22) 200 296 429
Oriental fruit moth (Biofix: April 12) 390 519 686
Tufted apple bud moth (Biofix: April 27) 193 321 488

About degree-day models


2022 Pest Trends (click to enlarge)

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