WNC Orchard Insect Pest Populations – June 12, 2024
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Based on degree-day accumulations (850 in Henderson and 1130 in Cleveland Counties), first generation codling moth egg hatch is essentially complete. However, some orchards, particularly at higher elevations, may have late-emerging or large codling moth populations that require continued insecticide treatments. Pheromone trap captures are the best method for gauging the need for additional insecticides during this period. Although many factors can affect pheromone trap captures, between 5 and 10 moths over a one week period can serve as a conservative threshold level.
As mentioned last week we have entered that period when several indirect pests are the major drivers of pest management decisions for the next few weeks. European red mite, apple aphids and potato leafhopper, all of which may or may not develop to damaging levels, should be the focus of monitoring programs at this time. To date aphids and leafhoppers have been below damaging levels in most orchards. Where present, mites populations could increase rapidly with the warm and dry conditions predicted in the near future. Applying miticides based on a threshold level of between 5 and 10 mites per leaf at this time will prevent populations from reaching damaging levels.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| May 28 | Jun 3 | Jun 10 | |
| Codling moth | 0.5 | 0.0 | 3.5 |
| Oriental fruit moth | 9.0 | 3.5 | 29.0 |
| Tufted apple bud moth | 20.0 | 25.0 | 16.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 3.0 | 0.0 | 2.0 |
| Lesser appleworm | 8.0 | 2.0 | 2.0 |
| Apple maggot (abandoned and research orchards) | – | – | 0.0 |
| Brown marmorated stink bug (commercial) | – | – | 0.5 |
| Brown marmorated stink bug (unsprayed) | 0.0 | 0.0 | 0.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 50.0 | 41.0 | 25.0 |
| Peachtree borer | 1.0 | 1.0 | 0.0 |
| Lesser peachtree borer | 20.0 | 3.0 | 18.0 |
| 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 28 | Jun 3 | Jun 10 | ||
| Codling moth (Biofix: April 15) | 602 | 679 | 814 | |
| Oriental fruit moth (Biofix: March 15) | 1096 | 1202 | 1372 | |
| Tufted apple bud moth (Biofix: April 15) | 802 | 908 | 1078 | |
2024 Pest Population Trends
