WNC Orchard Insect Pest Populations – May 12, 2025
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Recent hail in some orchards will surely affect decisions on continuing to invest in pesticide costs, but for those orchards where management will continue, codling moth and preventive applications of miticides for European red mite remain the primary focus this week. Refer to last week’s recommendations for European red mite management.
Codling Moth: As of May 12, codling moth degree-day accumulations range from about 250 in Henderson County to 475 in Cleveland County. First generation codling moth is most active from about 250 through about 700 or 800 DD, so this pest will remain a threat for the next two to four weeks, depending on location and temperature. The cool and rainy weather since late last week has not been conducive for moth mating, egg laying or survival of larvae hatching from eggs, so from an insecticide perspective it is better to wait until the current weather pattern breaks before making insecticide applications.
As summarized in last week’s codling moth update, codling moth egg hatch begins at about 250 DD, but will vary with population intensity. In orchards with low populations, delaying an initial application until 350 is recommended. However, with the time interval of 250 and 350 only about 5 days and weather not currently conducive for spraying, an application is recommended for most orchards as soon as the weather clears. The exception is in orchards using mating disruption or where pheromone trap captures remain very low.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2025 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Apr 28 | May 5 | May 12 | |
| Codling moth | 5.0 | 1.0 | 1.5 |
| Oriental fruit moth | 23.0 | 12.0 | 10.5 |
| Tufted apple bud moth | 48.0 | 49.0 | 48.0 |
| Redbanded leafroller | 1.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | set | 1.0 | 2.0 |
| Lesser appleworm | set | 14.0 | 6.0 |
| Apple maggot (research orchards) | n/a | n/a | n/a |
| Apple maggot (abandoned orchard) | n/a | n/a | n/a |
| Brown marmorated stink bug (commercial) | set | 1.1 | n/a |
| Brown marmorated stink bug (unsprayed research orchard) | 0.0 | 0.0 | 0.3 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 1.0 | 18.0 | 29.0 |
| Peachtree borer | set | 0.0 | 0.5 |
| Lesser peachtree borer | 81.0 | 49.5 | 9.0 |
| San Jose scale | 2.5 | 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 | ||||
| Apr 28 | May 5 | May 12 | ||
| Codling moth (Biofix: April 21) | 116 | 202 | 263 | |
| Oriental fruit moth (Biofix: March 17) | 413 | 666 | 757 | |
| Tufted apple bud moth (Biofix: April 14) | 111 | 343 | 435 | |
2025 Insect Population Trends
