WNC Orchard Insect Pest Populations – June 5, 2024
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With codling moth degree days at about 750 and 1000 in Henderson and Cleveland Counties, respectively, first generation flight is nearly complete in Henderson County and complete in the lower elevation Cleveland County. The need for further insecticides targeting first generation codling moth is unlikely unless there is a recent history of problems.
The window for control of tufted apple bud moth is still open in Henderson County, where cumulative degree days are at 990. It is a little late in lower elevation orchards, but historically TABM has been most important in Henderson County and less important in lower elevation orchards.
Second generation oriental fruit moth is in the early stages of emergence, but control of this generation is rarely needed when control of first generation was effective.
With the early season threat of the three major lepidopteran pests (codling moth, OFM, and TABM) now complete, it is time to focus on a group of indirect pests (aphids, leafhoppers and mites) that do not require preventive control. Over the next few weeks insecticide use can be minimized (and money saved) by monitoring for these pests and applying a pesticide only if needed.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| May 20 | May 28 | Jun 3 | |
| Codling moth | 0.5 | 0.5 | 0.0 |
| Oriental fruit moth | 12.0 | 9.0 | 3.5 |
| Tufted apple bud moth | 33.0 | 20.0 | 25.0 |
| Redbanded leafroller | 1.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 3.0 | 0.0 |
| Lesser appleworm | 0.0 | 8.0 | 2.0 |
| 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 | 0.0 | 0.0 |
| Dogwood borer | – | 50.0 | 41.0 |
| Peachtree borer | 0.0 | 1.0 | 1.0 |
| Lesser peachtree borer | 6.0 | 20.0 | 3.0 |
| 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 | ||||
| May 20 | May 28 | Jun 3 | ||
| Codling moth (Biofix: April 15) | 439 | 602 | 679 | |
| Oriental fruit moth (Biofix: March 15) | 893 | 1096 | 1202 | |
| Tufted apple bud moth (Biofix: April 15) | 599 | 802 | 908 | |
2024 Pest Population Trends
