WNC Orchard Insect Pest Populations – August 9, 2022
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In the vast majority of orchards, the major insect pests of potential threat for the remainder of the season are brown marmorated stink bug and apple maggot. Apple maggot fly captures remain low at our monitoring sites, but abundance and timing of emergence can vary among locations. Emergence of first generation BMSB adults is about 25 to 30% complete in Henderson and Wilkes Counties, respectively, while in lower-elevation orchards such as Cleveland County, it is about 70% complete (see model prediction below). 
In higher elevations such as Henderson and Wilkes Counties, now is good timing for an insecticide application in orchards with a history of BMSB damage, especially those cultivars with a moderate to high susceptibility (see below). Shown below is a table of relative susceptibility of various apple cultivars to BMSB damage, and the number of insecticide applications typically made to these cultivars. With the exception of Granny Smith apples, which are highly susceptible to damage, insecticides applied at 2-wk intervals up to about 14 days before harvest has worked well. Intervals may need to be shortened to 7 days on Granny Smith when BMSB populations are high.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2022 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Jul 25 | Aug 1 | Aug 8 | |
| Codling moth | 0.0 | 0.0 | 0.0 |
| Oriental fruit moth | 9.0 | 6.0 | 9.0 |
| Tufted apple bud moth | 0.0 | 0.0 | 1.0 |
| Redbanded leafroller | 1.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 1.0 | 0.0 | 0.0 |
| Lesser appleworm | 1.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 0.0 | 0.3 | 0.0 |
| Brown marmorated stink bug (commercial) | 1.5 | 1.2 | 1.6 |
| Brown marmorated stink bug (unsprayed) | 13.5 | 6.0 | 3.0 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 1.0 |
| Dogwood borer | 1.0 | 1.0 | 0.0 |
| Peachtree borer | 2.0 | 3.0 | 1.0 |
| Lesser peachtree borer | 7.0 | 4.0 | 9.0 |
| San Jose scale | 0.0 | 0.0 | 0.0 |
| Ambrosia beetle (all species) | 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.
2022 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Jul 25 | Aug 1 | Aug 8 | ||
| Codling moth (Biofix: April 22) | 1821 | 2020 | 2193 | |
| Oriental fruit moth (Biofix: April 12) | 2371 | 2598 | 2806 | |
| Tufted apple bud moth (Biofix: April 27) | 2173 | 2400 | 2608 | |
2022 Pest Trends (click to enlarge)
