WNC Orchard Insect Pest Populations – May 23, 2023
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As has been the case for the past couple of weeks, and will be for the next few weeks, first generation codling moth is the key pest at this time. Cumulative DD since biofix are about 450 (12% egg hatch complete) in Henderson County and 655 (40% egg hatch complete) in Cleveland County. However, with the relatively cool nights in higher elevations, flight activity and egg laying likely will be suppressed over the next several days. Moth activity begins around dusk and continues for several hours, but flight, mating and egg laying is suppressed when temperatures drop into the low 60s. With temperatures at or lower than 60 near sunset, this should help suppress activity through the weekend.
In lower elevation orchards such as Cleveland County, San Jose scale (SJS) crawler activity is underway. In fact, damage caused by crawlers feeding on fruit (red spots) was observed in at least one orchard. Hence, it would be wise to keep an eye out for SJS injury to fruit over the next few weeks. Assail has shown to be a good rescue treatment for SJS.
For those interested in tufted apple bud moth (TABM), we are at least two weeks from the ideal timing for control of this insect in Henderson County. As of today (5/23) we have accumulated about 450 DD since biofix, but the ideal timing for insecticidal control is about 800 DD. In lower elevation orchards, where TABM is usually less of a problem, DD accumulations are at about 640 DD, and 900 is predicted for early next week.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| May 8 | May 15 | May 22 | |
| Codling moth | 3.0 | 2.0 | 1.0 |
| Oriental fruit moth | 38.0 | 29.0 | 11.0 |
| Tufted apple bud moth | 6.0 | 13.0 | 50.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | – | 3.0 | 1.0 |
| Lesser appleworm | – | – | 11.0 |
| Apple maggot (abandoned and research orchards) | – | – | 0.0 |
| 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 | 4.0 | 27.0 | 21.0 |
| Peachtree borer | 0.0 | 4.0 | 0.0 |
| Lesser peachtree borer | 7.0 | 31.0 | 14.0 |
| 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.
2023 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| May 8 | May 15 | May 22 | ||
| Codling moth (Biofix: April 7) | 220 | 338 | 443 | |
| Oriental fruit moth (Biofix: March 24) | 508 | 662 | 801 | |
| Tufted apple bud moth (Biofix: April 21) | 155 | 308 | 448 | |
2023 Pest Population Trends
