WNC Orchard Insect Pest Populations – June 27, 2023
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Throughout the region, we are still in the period when the threat of damage by direct pests, including codling moth, oriental fruit moth, and tufted apple bud moth, is very low. Consequently, this is when the need for insecticides is at its lowest. In most situations, insecticides will only be needed for indirect pests that have exceeded threshold levels, and this includes green apple aphids, leafhoppers, European red mite and Japanese beetles. For the most part, aphids and leafhoppers have been very low thus far, while European red mite pressure has been fairly high. With temperatures beginning to warm up, expect ERM populations to continue to pose a threat. Japanese beetle populations will also continue to increase. Monitoring for these pests and applying insecticides only if needed will save money at this time.
Looking ahead to next week, second generation codling moth and first generation plum curculio adults will become more important in lower elevations (Cleveland County), while things should remain similar to this week in higher elevations (Henderson County and similar elevations).
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| June 12 | June 19 | June 26 | |
| Codling moth | 0.0 | 0.5 | 0.0 |
| Oriental fruit moth | 13.5 | 17.5 | 15.0 |
| Tufted apple bud moth | 12.0 | 1.0 | 1.0 |
| Redbanded leafroller | 8.0 | 0.0 | 2.0 |
| Obliquebanded leafroller | 7.0 | 2.0 | 1.0 |
| Lesser appleworm | 4.0 | 0.0 | 1.0 |
| Apple maggot (abandoned and research orchards) | 0.0 | 0.0 | 0.0 |
| Brown marmorated stink bug (commercial) | – | – | – |
| Brown marmorated stink bug (unsprayed) | 0.3 | 0.3 | 0.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 1.0 |
| Dogwood borer | 18.0 | 19.0 | 15.0 |
| Peachtree borer | 0.0 | 2.0 | 0.0 |
| Lesser peachtree borer | 3.0 | 1.0 | 0.0 |
| 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.
2023 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| June 12 | June 19 | June 26 | ||
| Codling moth (Biofix: April 7) | 716 | 829 | 948 | |
| Oriental fruit moth (Biofix: March 24) | 1176 | 1323 | 1478 | |
| Tufted apple bud moth (Biofix: April 21) | 823 | 970 | 1124 | |
2023 Pest Population Trends
