WNC Orchard Insect Pest Populations – September 8, 2021
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Brown marmorated stink bug populations continue to increase throughout the region. Captures on pheromone traps averaged 21.7 in Cleveland County and 28.1 in Henderson County. These are high numbers, and indicate that they still pose a threat to late-maturing apples. An insecticide application is recommended on anything that will be harvested in more than two weeks. Based on the degree-day model, first generation emergence is approximately 50, 75 and 97% complete in Henderson, Wilkes and Cleveland Counties.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2021 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 23 | Aug 31 | Sep 7 | |
| Codling moth | 0.5 | 0.0 | 0.0 |
| Oriental fruit moth | 20.0 | 54.0 | 43.0 |
| Tufted apple bud moth | 0.0 | 0.0 | 0.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 1.3 | 2.7 | 1.3 |
| Brown marmorated stink bug (commercial) | 12.5 | 28.0 | 25.0 |
| Brown marmorated stink bug (unsprayed) | 12.1 | 29.5 | 41.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 17.0 | 33.0 | 21.0 |
| Peachtree borer | 20.0 | 18.0 | 17.0 |
| Lesser peachtree borer | 45.0 | 31.0 | 24.0 |
| 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.
2021 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Aug 23 | Aug 31 | Sep 7 | ||
| Codling moth (Biofix: April 10) |
2342 | 2519 | 2685 | |
| Oriental fruit moth (Biofix: March 27) |
3081 | 3293 | 3498 | |
| Tufted apple bud moth (Biofix: April 30) |
2722 | 2934 | 3139 | |
2021 Pest Trends (click to enlarge)
Visit WNC Orchard Insect Populations for archived posts.