WNC Orchard Insect Pest Populations – July 10, 2024

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Brown marmorated stink bugBased on degree-day accumulations, the codling moth  degree-day (DD) model predicts that second generation adult emergence is about 30% and 60% complete in Henderson County (1533 DD) and Cleveland County (1890 DD). Unless captures in pheromone traps consistently average more than 5 moths/week, it is unlikely that more than two insecticide applications will be necessary against the second generation. If trap captures remain consistently low, one application may suffice.

Orchards treated with mating disruption generally do not require insecticide treatments for the second generation, although pheromone trapping is recommended to account for the unexpected.

First generation brown marmorated stink bug adults are predicted to begin emerging this week in lower elevation orchards such as Cleveland County, where 750 DD is predicted to occur on Saturday. If concerned about damage from this pest, next week would be optimum timing for a pyrethroid application. Populations have generally been low thus far, but that is not always a good predictor of the intensity of first generation adult populations. In Henderson County where DD accumulations have only reached 540, it’ll be several more weeks before adult emergence begins.

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

2024 Average Weekly Trap Captures

Insects per trap
Jun 24 Jul 2 Jul 8
Codling moth  0.5 2.0 0.5
Oriental fruit moth 12.0 14.5 12.0
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 4.0 0.0 0.0
Apple maggot (research orchards) 0.0 0.0 0.0
Apple maggot (abandoned orchard) 2.0 0.0 0.0
Brown marmorated stink bug (commercial) 1.3 0.3 0.3
Brown marmorated stink bug (unsprayed research orchard) 1.0 0.7 0.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 31.0 48.0 42.0
Peachtree borer 10.0 1.0 15.0
Lesser peachtree borer 2.0 8.0 5.0
San Jose scale 200.0 165.0 66.5

*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.

2024 Accumulated Degree Days

Jun 24 July 2 July 8
Codling moth (Biofix: April 15) 1128 1326 1483
Oriental fruit moth (Biofix: March 15) 1756 1994 2176
Tufted apple bud moth (Biofix: April 15) 1462 1700 1882

About degree-day models

2024 Pest Population Trends

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Written By

Jim Walgenbach, N.C. Cooperative ExtensionDr. Jim WalgenbachProfessor & Extension Entomology Specialist (Fruits / Vegetables) Call Dr. Jim Email Dr. Jim Entomology & Plant Pathology
NC State Extension, NC State University
Posted on Jul 10, 2024
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