Current Western NC Orchard Pest Populations Sept 8, 2015
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Collapse ▲We track local insect populations throughout the growing season using a system of traps, temperature-recording devices, and degree-day models. Traps and weather data are checked weekly, with results updated by Tuesday afternoon from April through September. Learn more about southeastern apple pests at the Apple Pest Management page.
Weekly summary
SEPTEMBER 8, 2015
With harvest well under way and insect populations beginning to decline, there are few potential reasons for additional insecticide use in apples at this point in time. Hence, this will be the last Pest News Article for 2015, although trap captures will continue to be posted through the end of September.
As noted last week, it is rare for insect problems to suddenly develop in September when the orchard has been relatively free of damage up to this point in time. The brown marmorated stink bug is one exception, and could remain a potential problem for the next 7 to 10 days in those orchards that have experienced damage in recent weeks. Trees adjacent to woods bordering orchards are at greatest risk. However, within the next 7 to 10 days, adults will change their behavior from one of feeding to one of flying to overwintering sites. The third week of September is when the largest dispersal flights to overwintering sites occur.
Average Weekly Trap Captures*
HENDERSON COUNTY | |||
Insects per trap | |||
Aug 24 |
Aug 31 |
Sep 8 |
|
Codling Moth |
6.3 | 13.7 | 9.0 |
Oriental Fruit Moth |
2.3 | 9.3 | 5.0 |
Tufted Apple Bud Moth | 1.0 | 11.0 | 14.5 |
Redbanded Leafroller | 0.0 | 3.0 | 2.5 |
Obliquebanded Leafroller | 0.0 | 2.0 | 0.5 |
Lesser Appleworm | 0.0 | 0.5 | 2.0 |
Apple Maggot | 1.5 | 0.5 | 1.0 |
Brown Marmorated Stink Bug | 0.3 | 1.0 | 1.3 |
Spotted Tentiform Leafminer | 21.0 | 21.0 | 17.0 |
Dogwood Borer | 10.0 | 51.0 | 14.0 |
Peachtree Borer | 28.5 | 19.0 | 9.0 |
Lesser Peachtree Borer | 35.5 | 45.5 | 48.5 |
San Jose Scale | 1035.5 | 202.5 | 317.5 |
*Note that averages presented here are intended only to illustrate the timing of insect emergence and fluctuations in population activity, and not as general indicators of population levels. Some orchards included in these averages have significantly higher or lower populations than most commercial orchards in the area, resulting in averages that are sometimes skewed from what is typical. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.
Accumulated Degree Days
Henderson County | ||||
Biofix | Aug 24 |
Aug 31 |
Sep 8 |
|
Codling Moth | April 23 |
2500 | 2633 | 2821 |
Oriental Fruit Moth | Apr 6 |
3322 | 3490 | 3716 |
Tufted Apple Bud Moth | April 23 |
3062 | 3230 | 3456 |
About degree-day models:The degree day (DD) models predict adult emergence and egg hatch of each generation. They do not predict the intensity of populations, which can be assessed by using pheromone traps. Hence, the models should be used to help gauge the time period when control is most likely needed, and pheromone traps provide information on the need for and frequency of insecticide applications. For full details, read “IPM Practices for Selected Pests” in the Orchard Management Guide. |
CODLING MOTH:
|
ORIENTAL FRUIT MOTH:
|
TUFTED APPLE BUD MOTH:
|