WNC Orchard Insect Pest Populations – August 14, 2024
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We’re approaching that later-season time period when brown marmorated stink bug and apple maggot are key potential pests. Emergence of first generation adult BMSB populations are about 30% and 80% complete in Henderson and Cleveland Counties, respectively. Percentage emergence will be slightly behind at higher elevations and ahead at lower elevations. Remember that later-maturing cultivars are generally more susceptible to BMSB damage, while cultivars harvested before Labor Day are considerably less susceptible to damage.
Apple maggot trap captures increased to about 6 per trap near an abandoned orchard in Henderson County this week. In contrast to BMSB, apple maggot emergence often occurs sooner at higher- versus lower-elevation orchards, so this increase about two weeks after Avery County reported increased activity is consistent with historical trends. Pyrethroids applied for BMSB will also provide excellent control of apple maggot where this insect is of concern. In situations where insecticides are not applied for BMSB, imidacloprid (e.g., Admire Pro or a generic product) will also provide good control.
Finally, remember that the 2024 Mountain Hort Field Day and 75th Anniversary Celebration is Thursday, August 15th. The event is free and registration for orchard tours begins at 8:00 a.m.!
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Jul 29 | Aug 5 | Aug 12 | |
| Codling moth | 1.5 | 0.5 | 2.5 |
| Oriental fruit moth | 11.0 | 11.0 | 15.5 |
| Tufted apple bud moth | 0.0 | 0.0 | 11.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 1.0 | 2.0 | 7.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 0.0 | 2.0 | 6.0 |
| Brown marmorated stink bug (commercial) | 1.0 | 1.3 | 0.7 |
| Brown marmorated stink bug (unsprayed research orchard) | 0.7 | 0.3 | 0.7 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 28.0 | 18.0 | 45.0 |
| Peachtree borer | 2.0 | 14.0 | 14.0 |
| Lesser peachtree borer | 6.0 | 4.0 | 10.0 |
| San Jose scale | 2.5 | 5.0 | 5.0 |
*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 | ||||
| Jul 29 | Aug 5 | Aug 12 | ||
| Codling moth (Biofix: April 15) | 2026 | 2184 | 2347 | |
| Oriental fruit moth (Biofix: March 15) | 2829 | 3017 | 3215 | |
| Tufted apple bud moth (Biofix: April 15) | 2535 | 2723 | 2921 | |
2024 Pest Population Trends
