WNC Orchard Insect Pest Populations – July 18, 2024
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Second generation codling moth is still a potential concern throughout the region. At about 1720 and 2100 degree-day (DD) accumulations, adult emergence is about 40% and 70% complete in Henderson and Cleveland County, respectively. See the June 26 update for more information on the need and options for insecticidal control.
Emergence of first generation brown marmorated stink bug (BMSB) has begun in Cleveland County, where about 15% of the adult population has emergence as of June 17 (about 800 DD). Only 608 DD have accumulated since biofix in Henderson County, and it will be at least another 2 weeks before emergence begins (at 740 DD) at this elevation. It is noteworthy that DD accumulations for BMSB are about 2 weeks ahead of last year. Also, to date BMSB pheromone trap captures have been very low. Hopefully the trend of declining BMSB populations we’ve seen in recent years will continue.
There have been some questions about insecticides for control of Japanese beetles and June bugs. There are a wide range of products that will provide effective control, including carbaryl (Sevin), and most neonicotinoids and pyrethroids. I would opt for either carbaryl or a neonicotinoid (check PHI of the product) at this time in locations where BMSB emergence has not yet begun, since the later that pyrethroid applications can be delayed for BMSB the lower the chance of flaring secondary pests (e.g., primarily scale and woolly apple aphid at this time).
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Jul 2 | Jul 8 | Jul 15 | |
| Codling moth | 2.0 | 0.5 | 3.0 |
| Oriental fruit moth | 14.5 | 12.0 | 14.5 |
| Tufted apple bud moth | 0.0 | 0.0 | 1.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 0.0 | 0.0 | 1.0 |
| Brown marmorated stink bug (commercial) | 0.3 | 0.3 | 0.7 |
| Brown marmorated stink bug (unsprayed research orchard) | 0.7 | 0.0 | 0.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 48.0 | 42.0 | 38.0 |
| Peachtree borer | 1.0 | 1.0 | 10.0 |
| Lesser peachtree borer | 8.0 | 5.0 | 1.0 |
| San Jose scale | 165.0 | 66.5 | 17.5 |
*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.
2024 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Jul 2 | Jul 8 | July 15 | ||
| Codling moth (Biofix: April 15) | 1326 | 1483 | 1665 | |
| Oriental fruit moth (Biofix: March 15) | 1994 | 2176 | 2393 | |
| Tufted apple bud moth (Biofix: April 15) | 1700 | 1882 | 2099 | |
2024 Pest Population Trends
