WNC Orchard Insect Pest Populations – May 29, 2024
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Codling moth degree-day (DD) accumulations are currently about 620 and 830 in Henderson and Cleveland Counties, respectively. At 620 DD, first generation egg hatch is about 50% complete, while at 830 DD it is more than 80% complete. Unless there is a history of codling moth damage, the need for additional insecticides in lower elevation orchards (less than about 1200 ft) is questionable.
Tufted apple bud moth DDs range from about 830 in Henderson County to 1000 in Cleveland County, which is the window for optimum timing of insecticides for control of TABM. As mentioned in last week’s update, a single application of Intrepid, a diamide (Altacor, Exirel, Verdepryn) or Delegate will provide season-long control.
With June approaching, expect aphids, leafhoppers and mites to begin to appear over the next few weeks. These are all pests that can be managed curatively, so scouting to determine the need for management action will help to minimize pesticide inputs.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| May 13 | May 20 | May 28 | |
| Codling moth | 1.0 | 0.5 | 0.5 |
| Oriental fruit moth | 11.0 | 12.0 | 9.0 |
| Tufted apple bud moth | 20.0 | 33.0 | 20.0 |
| Redbanded leafroller | 0.0 | 1.0 | 0.0 |
| Obliquebanded leafroller | 1.0 | 0.0 | 3.0 |
| Lesser appleworm | 4.0 | 0.0 | 8.0 |
| Apple maggot (abandoned and research orchards) | – | – | – |
| Brown marmorated stink bug (commercial) | – | – | – |
| Brown marmorated stink bug (unsprayed) | 0.0 | 0.0 | 0.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 22.0 | – | 50.0 |
| Peachtree borer | 0.0 | 0.0 | 1.0 |
| Lesser peachtree borer | 7.0 | 6.0 | 20.0 |
| 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.
2024 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| May 13 | May 20 | May 28 | ||
| Codling moth (Biofix: April 15) | 336 | 439 | 602 | |
| Oriental fruit moth (Biofix: March 15) | 755 | 893 | 1096 | |
| Tufted apple bud moth (Biofix: April 15) | 461 | 599 | 802 | |
2024 Pest Population Trends
