WNC Orchard Insect Pest Populations – August 28, 2024
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Not much has changed in the past week, with brown marmorated stink bug (BMSB) being the main pest of concern, and the threat of damage highest on late-maturing cultivars. With about 55% of the F1 adult population emerged in Henderson County (90% in Cleveland County), overall numbers are comparatively low compared to past years. This continues a trend observed during the past 3 years, in which overall populations as measured by pheromone trap captures continues to decline. However, in the absence of reliable threshold levels, a pyrethroid application up through the first week of September on cultivars harvested after mid- to late September is recommended.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 12 | Aug 19 | Aug 26 | |
| Codling moth | 2.5 | 0.5 | 0.0 |
| Oriental fruit moth | 15.5 | 12.0 | 5.5 |
| Tufted apple bud moth | 11.0 | 1.0 | 3.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 7.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 1.0 |
| Apple maggot (research orchards) | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned orchard) | 6.0 | 1.0 | 3.0 |
| Brown marmorated stink bug (commercial) | 0.7 | 1.4 | 5.0 |
| Brown marmorated stink bug (unsprayed research orchard) | 0.7 | 1.7 | 4.7 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 45.0 | 58.0 | 49.0 |
| Peachtree borer | 14.0 | 14.0 | 16.0 |
| Lesser peachtree borer | 10.0 | 11.0 | 25.0 |
| San Jose scale | 5.0 | 127.5 | 40.0 |
*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 | ||||
| Aug 12 | Aug 19 | Aug 26 | ||
| Codling moth (Biofix: April 15) | 2347 | 2514 | 2656 | |
| Oriental fruit moth (Biofix: March 15) | 3215 | 3417 | 3600 | |
| Tufted apple bud moth (Biofix: April 15) | 2921 | 3123 | 3306 | |
2024 Pest Population Trends
