WNC Orchard Insect Pest Populations – May 8, 2024
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Codling moth remains the key potential pest at this time throughout the region, ranging from early to mid-egg hatch of the first generation. Degree-days range from about 275 DD (5% egg hatch) in Henderson County (2050 ft elevation) to 420 DD (35% egg hatch) in Cleveland County (900 ft). Cooler temperatures are predicted beginning Friday, which will result in conditions less conducive to egg laying for about a week.
If targeting San Jose crawlers for insecticidal control, we are at the tail end of the ideal timing of that application. If this spray has not yet been made, it should be made as soon as possible.
For those considering preventive control of European red mite, first to second cover sprays are generally good timing for these applications. More important than timing is to apply materials when mites are still low in numbers.
Insecticide recommendations provided last week are still relevant, and will be for the next few weeks.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Apr 22 | Apr 29 | May 6 | |
| Codling moth | 4.5 | 1.0 | 0.0 |
| Oriental fruit moth | 60.0 | 28.5 | 21.5 |
| Tufted apple bud moth | 3.0 | 11.0 | 16.0 |
| Redbanded leafroller | 4.0 | 6.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | – | – | – |
| Brown marmorated stink bug (commercial) | – | – | – |
| Brown marmorated stink bug (unsprayed) | 0.7 | 0.0 | 0.0 |
| Spotted tentiform leafminer | 2.0 | 0.0 | n/a |
| Dogwood borer | 0.0 | 0.0 | 17.0 |
| Peachtree borer | 0.0 | 0.0 | 0.0 |
| Lesser peachtree borer | 4.0 | 2.0 | 12.0 |
| 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 22 | Apr 29 | May 6 | ||
| Codling moth (Biofix: April 15) | 77 | 139 | 239 | |
| Oriental fruit moth (Biofix: March 15) | 401 | 490 | 625 | |
| Tufted apple bud moth (Biofix: April 15) | 107 | 196 | 331 | |
2024 Pest Population Trends
