WNC Orchard Insect Pest Populations – August 27, 2025
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With the exception of the brown marmorated stink bug (BMSB), trap captures of key pests declined during the past week, with codling moth and apple maggot numbers declining at both the research station and in commercial orchards in Henderson County. If codling moth has not been an issue by late August, the potential for a problem to develop at this time is unlikely. While oriental fruit moth (OFM) can be a problem into September, a pyrethroid spray for BMSB during the past two weeks likely reduces the chances of this occurring.
We did see a bump in BMSB trap captures this past week, with average numbers increasing from about 2.4 last week to 5.6 this week. This is in line with numbers in late August last year, while about four years ago the average capture was >20 adults in late August. So overall populations appear to be declining long-term. About 975 degree days (DD) have accumulated thus far in Henderson County, which is equivalent to about 50% emergence of the F1 adult generation. In lower elevation Cleveland County, 1240 DD have accumulated, which is equal to about 90% emergence of F1 adults.
2025 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 11 | Aug 18 | Aug 25 | |
| Codling moth | 1.0 | 0.5 | 0.0 |
| Oriental fruit moth | 11.0 | 19.0 | 11.0 |
| Tufted apple bud moth | 10.0 | 1.0 | 2.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 1.0 | 0.0 | 0.0 |
| Lesser appleworm | 6.0 | 0.0 | 2.0 |
| Apple maggot (unsprayed research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 10.5 | 5.5 | 0.0 |
| Brown marmorated stink bug (commercial orchards) | 0.4 | 2.4 | 5.6 |
| Brown marmorated stink bug (unsprayed research orchards) | 0.0 | 1.3 | 2.7 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 37.0 | 23.0 | 41.0 |
| Peachtree borer | 16.5 | 17.0 | 16.0 |
| Lesser peachtree borer | 33.0 | 38.0 | 41.5 |
| 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.
2025 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Aug 11 | Aug 18 | Aug 25 | ||
| Codling moth (Biofix: April 21) | 2241 | 2424 | 2589 | |
| Oriental fruit moth (Biofix: March 17) | 3163 | 3382 | 3581 | |
| Tufted apple bud moth (Biofix: April 14) | 2841 | 3059 | 3259 | |
2025 Insect Population Trends
