WNC Orchard Insect Pest Populations – August 31, 2021
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Brown marmorated stink bug adult emergence continues across all apple production areas, ranging from about 40% complete in Henderson County to almost 90% in Cleveland County. Pheromone trap captures also increased by more than two-fold during the past week in Henderson County, indicative of the increasing populations. Across 9 different locations in Henderson County, trap captures averaged about 26 per trap. In Cleveland County, trap captures remained steady at about 12 per trap. Continued protection of apples that are at least 10 to 14 days from harvest is recommended. Check the list of BMSB recommended insecticides for preharvest intervals.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2021 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 16 | Aug 23 | Aug 31 | |
| Codling moth | 0.5 | 0.5 | 0.0 |
| Oriental fruit moth | 17.5 | 20.0 | 54.0 |
| Tufted apple bud moth | 0.0 | 0.0 | 0.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 1.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 0.7 | 1.3 | 2.7 |
| Brown marmorated stink bug (commercial) | 6.5 | 12.5 | 29.5 |
| Brown marmorated stink bug (unsprayed) | 4.5 | 12.1 | 28.0 |
| Spotted tentiform leafminer | 10.0 | 0.0 | 0.0 |
| Dogwood borer | 33.0 | 17.0 | 33.0 |
| Peachtree borer | 9.0 | 20.0 | 18.0 |
| Lesser peachtree borer | 24.0 | 45.0 | 31.0 |
| 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.
2021 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Aug 16 | Aug 23 | Aug 31 | ||
| Codling moth (Biofix: April 10) |
2175 | 2342 | 2934 | |
| Oriental fruit moth (Biofix: March 27) |
2879 | 3081 | 3293 | |
| Tufted apple bud moth (Biofix: April 30) |
2520 | 2722 | 2934 | |
2021 Pest Trends (click to enlarge)
Visit WNC Orchard Insect Populations for archived posts.