WNC Orchard Insect Pest Populations – September 3, 2025
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Little has changed in insect activity during the past week, with trap captures continually being low or on the decline in most commercial orchards. The exception is brown marmorated stink bug (BMSB), which appear to be slightly increasing. A total of 1008 BMSB degree days (DD) have accumulated since biofix in Henderson County, which is equivalent to 57% emergence of first generation adults. In Cleveland County, a total of 1286 DD have accumulated, indicating that 95% of first generation adults have emerged. While an insecticide application for BMSB may have some value on late maturing cultivars in higher elevation orchards, additional insecticides for BMSB in lower elevation orchards are probably not necessary.
With harvest in full swing and insects expected to pose a low threat to the crop from this point forward, this will be the last pest update for 2025. If something unusual pops up, we’ll send out an alert.
2025 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 18 | Aug 25 | Sep 2 | |
| Codling moth | 0.5 | 0.0 | 0.0 |
| Oriental fruit moth | 19.0 | 11.0 | 17.5 |
| Tufted apple bud moth | 1.0 | 2.0 | 2.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 2.0 | 0.0 |
| Apple maggot (unsprayed research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 5.5 | 0.0 | 3.0 |
| Brown marmorated stink bug (commercial orchards) | 2.4 | 5.6 | 4.0 |
| Brown marmorated stink bug (unsprayed research orchards) | 1.3 | 2.7 | 8.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 23.0 | 41.0 | 48.0 |
| Peachtree borer | 17.0 | 16.0 | 17.0 |
| Lesser peachtree borer | 38.0 | 41.5 | 30.5 |
| 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 18 | Aug 25 | Sep 2 | ||
| Codling moth (Biofix: April 21) | 2424 | 2589 | 2709 | |
| Oriental fruit moth (Biofix: March 17) | 3382 | 3581 | 3741 | |
| Tufted apple bud moth (Biofix: April 14) | 3059 | 3259 | 3419 | |
2025 Insect Population Trends
