WNC Orchard Insect Pest Populations – August 30, 2022
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Not much has changed since last week in terms of the key insect pests of concern at this time. First generation brown marmorated stink bug adults continue to emerge, but numbers remain low compared to populations at similar times in past years. Also, apple maggot fly captures have been low in Henderson County, but as mentioned last week this can vary among orchards, particularly in areas where there may be sources of flies near managed orchards or at higher elevations. Although oriental fruit moth pheromone trap captures have increased in the past week at the research station, these are in orchards that are minimally sprayed.
Finally, there have been some reports of late-season European red mite populations showing up in some orchards. Population increases after July are not common, and this probably a response to recent pyrethroid applications made for stink bugs. Trees can generally tolerate higher numbers of mites later in the season, in the range of 10-15 mites per leaf.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2022 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Aug 15 | Aug 22 | Aug 29 | |
| Codling moth | 1.0 | 0.0 | 0.0 |
| Oriental fruit moth | 15.0 | 11.0 | 29.5 |
| Tufted apple bud moth | 0.0 | 0.0 | 0.0 |
| Redbanded leafroller | 0.0 | 0.0 | 0.0 |
| Obliquebanded leafroller | 0.0 | 0.0 | 0.0 |
| Lesser appleworm | 0.0 | 0.0 | 0.0 |
| Apple maggot (abandoned and research orchards) | 0.0 | 0.0 | 0.0 |
| Brown marmorated stink bug (commercial) | 1.9 | 1.3 | 2.0 |
| Brown marmorated stink bug (unsprayed) | 4.5 | 4.5 | 9.5 |
| Spotted tentiform leafminer | 0.0 | 0.0 | 0.0 |
| Dogwood borer | 0.0 | 0.0 | 0.0 |
| Peachtree borer | 1.0 | 7.0 | 16.0 |
| Lesser peachtree borer | 9.0 | 7.0 | 13.0 |
| San Jose scale | 0.0 | 0.0 | 70.0 |
| Ambrosia beetle (all species) | 0.0 | 0.0 | 1.0 |
*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 | ||||
| Aug 15 | Aug 22 | Aug 29 | ||
| Codling moth (Biofix: April 22) | 2358 | 2506 | 2668 | |
| Oriental fruit moth (Biofix: April 12) | 3005 | 3189 | 3385 | |
| Tufted apple bud moth (Biofix: April 27) | 2828 | 2991 | 3188 | |
2022 Pest Trends (click to enlarge)
