WNC Orchard Insect Pest Populations – August 19, 2025
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Codling moth and oriental fruit moth (OFM): With the exception of locations that have had high codling moth problems for much of the year, trap captures remain very low in managed orchards. OFM numbers have also been low in most managed orchards. In general, the potential for codling moth or OFM to suddenly become an issue this late in the year is very low if there have not yet been signs of damage.
Apple maggot: Capture of apple maggot flies have declined in each of the past three weeks. Numbers reached their peak at 29 per trap on 28 July, and this week averaged only 5.5 per trap. We are likely past the key apple maggot period.
Brown marmorated stink bug (BMSB): Finally, BMSB trap captures finally increased slightly this week for the first time, with an average of 2.4 adults per trap in Henderson County. This is still a very low number, supporting previous data that suggests populations are declining in western NC. At this time, about 46% of first generation adults have emerged. In Cleveland County, the degree-day model indicates that about 80% have emerged.
2025 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 4 | Aug 11 | Aug 18 | |
| Codling moth | 1.5 | 1.0 | 0.5 |
| Oriental fruit moth | 9.0 | 11.0 | 19.0 |
| Tufted apple bud moth | 0.0 | 10.0 | 1.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 2.0 | 1.0 | 0.0 |
| Lesser appleworm | 0.0 | 6.0 | 0.0 |
| Apple maggot (unsprayed research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 18.0 | 10.5 | 5.5 |
| Brown marmorated stink bug (commercial orchards) | 0.8 | 0.4 | 2.4 |
| Brown marmorated stink bug (unsprayed research orchards) | 0.0 | 0.0 | 1.3 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 25.0 | 37.0 | 23.0 |
| Peachtree borer | 17.5 | 16.5 | 17.0 |
| Lesser peachtree borer | 17.5 | 33.0 | 38.0 |
| 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 4 | Aug 11 | Aug 18 | ||
| Codling moth (Biofix: April 21) | 2120 | 2241 | 2424 | |
| Oriental fruit moth (Biofix: March 17) | 2999 | 3163 | 3382 | |
| Tufted apple bud moth (Biofix: April 14) | 2677 | 2841 | 3059 | |
2025 Insect Population Trends
