WNC Orchard Insect Pest Populations – May 15, 2024
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Codling 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
| HENDERSON COUNTY | |||
| 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
| HENDERSON COUNTY | ||||
| 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 | |
2024 Pest Population Trends
