WNC Orchard Insect Pest Populations – August 15, 2023
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Based on the degree-day model, emergence of the brown marmorated stink bug is underway in most areas, with DD accumulations at 755 in Henderson County, 771 in Wilkes County, and 1,000 in Cleveland County, which is equivalent to emergence of about 5%, 8% and 55% of first generation adults, respectively. Those varieties that will be harvested after September 1 are most vulnerable to damage. Refer to the July 26 pest update for BMSB insecticide recommendations.
In those few orchards where there is still concern about codling moth or oriental fruit moth, pyrethroid applications for BMSB should provide good control of OFM, but it may not be sufficient for codling moth. If codling moth has been an issue, consider using Besiege (21-day PHI), or tank mixing either Altacor (5-day PHI) or Delegate (7-day PHI) with a pyrethroid that has a shorter PHI.
The first captures of apple maggot on traps near our abandoned orchard site occurred this week. Pyrethroids applied for BSMB will also control apple maggot.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 1 | Aug 8 | Aug 14 | |
| Codling moth | 4.5 | 1.0 | 1.0 |
| Oriental fruit moth | 13.5 | 11.0 | 10.5 |
| Tufted apple bud moth | 1.0 | 0.0 | 0.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 2.0 | 0.0 |
| Lesser appleworm | 1.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 0.0 | 0.0 | 1.7 |
| Brown marmorated stink bug (commercial) | 1.7 | 1.1 | 1.8 |
| Brown marmorated stink bug (unsprayed) | 1.0 | 0.7 | 0.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 11.0 | 20.0 | 13.0 |
| Peachtree borer | 7.5 | 3.5 | 4.0 |
| Lesser peachtree borer | 2.5 | 0.0 | 2.5 |
| 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 | ||||
| Aug 1 | Aug 7 | Aug 14 | ||
| Codling moth (Biofix: April 7) | 1802 | 1938 | 2098 | |
| Oriental fruit moth (Biofix: March 24) | 2506 | 2673 | 2867 | |
| Tufted apple bud moth (Biofix: April 21) | 2153 | 2320 | 2514 | |
2023 Pest Population Trends
