WNC Orchard Insect Pest Populations – May 15, 2024

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Trap in apple orchardCodling Moth remains the primary insect of concern at this time. As of May 14, the egg hatch model varied from 360 (20% egg hatch) to 530 degree days (60% egg hatch) in Henderson and Cleveland County, respectively. While there have not been reports of high populations, insecticides are important at this time if not monitoring populations with pheromone traps or not using mating disruption.

In orchards using mating disruption for codling moth, one insecticide application during first generation flight timed for tufted apple bud moth sprays is usually sufficient. This will occur in about one week in lower elevation orchards and in at least two weeks in higher elevation orchards (≥2000 ft elevation).

For those choosing preventive control of European red mite, an application within the next week or so is ideal timing. For resistance management, choose products with a different mode of action (MOA) annually – i.e., do not apply the same MOA in consecutive years. Materials effective for this strategy at this time are Apollo or Savey (both same MOA 10A), Zeal (MOA 10B), and Envidor (MOA 23).

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

2024 Average Weekly Trap Captures

Insects per trap
Apr 29 May 6 May 13
Codling moth  1.0 0.0 1.0
Oriental fruit moth 28.5 21.5 11.0
Tufted apple bud moth 11.0 16.0 20.0
Redbanded leafroller 6.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 1.0
Lesser appleworm 0.0 0.0 4.0
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 0.0 n/a 0.0
Dogwood borer 0.0 17.0 22.0
Peachtree borer 0.0 0.0 0.0
Lesser peachtree borer 2.0 12.0 7.0
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.

2024 Accumulated Degree Days

Apr 29 May 6 May 13
Codling moth (Biofix: April 15) 139 239 336
Oriental fruit moth (Biofix: March 15) 490 625 755
Tufted apple bud moth (Biofix: April 15) 196 331 461

About degree-day models

2024 Pest Population Trends

Chart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trends

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 May 15, 2024
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