WNC Orchard Insect Pest Populations – August 22, 2023
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Emergence of first generation adults of the brown marmorated stink bug ranges from about 15% (Henderson County) to 67% (Cleveland County) completion in the region. Degree-day accumulations as of 22 August were 810, 1071 and 826 in Henderson, Cleveland and Wilkes Counties. BMSB will be the main focus for the next several weeks.
Oriental fruit moth pheromone trap captures continue to increase in our research plots at the MHCREC. Late-season OFM populations are not unexpected when pyrethroids are not being used for BMSB. Where pyrethroids are being used for BMSB and/or where mating disruption is used, OFM should not be a problem.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 8 | Aug 14 | Aug 21 | |
| Codling moth | 1.0 | 1.0 | 0.5 |
| Oriental fruit moth | 11.0 | 10.5 | 31.5 |
| Tufted apple bud moth | 0.0 | 0.0 | 2.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 2.0 | 0.0 | 2.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 0.0 | 1.7 | 3.7 |
| Brown marmorated stink bug (commercial) | 1.1 | 1.8 | 1.9 |
| Brown marmorated stink bug (unsprayed) | 0.7 | 0.0 | 3.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 20.0 | 13.0 | 29.0 |
| Peachtree borer | 3.5 | 4.0 | 6.5 |
| Lesser peachtree borer | 0.0 | 2.5 | 4.0 |
| San Jose scale | 0.0 | 0.0 | 37.5 |
*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 | ||||
| Aug 7 | Aug 14 | Aug 21 | ||
| Codling moth (Biofix: April 7) | 1938 | 2098 | 2249 | |
| Oriental fruit moth (Biofix: March 24) | 2673 | 2867 | 3054 | |
| Tufted apple bud moth (Biofix: April 21) | 2320 | 2514 | 2701 | |
2023 Pest Population Trends
