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.
Overall, insect populations have changed little in the past couple of weeks, with codling moth and oriental fruit remaining relatively low in the vast majority of locations, and apple maggot continuing to be captured in abandoned orchards.
First generation brown marmorated stink bug adults have emerged at all locations, but numbers appear to be somewhat lower than last year. There has been no evidence of damage in commercial orchards in Henderson or Polk Counties this year, but there may be local hotspots that we are not aware of at this time. Bill Hanlin has reported higher activity in orchards in Wilkes and Alexander Counties. Please contact us if suspected damage is noted on fruit.
2014 Average Weekly Trap Captures*
|HENDERSON COUNTY||POLK COUNTY|
|Insects per trap||Insects per trap|
|Oriental Fruit Moth
|Tufted Apple Bud Moth||2.0||5.0||6.5||0.0||4.0||1.0|
|Brown Marmorated Stink Bug||0.3||0.3||0.8||-||-||-|
|Spotted Tentiform Leafminer||23.0||30.0||34.0||-||-||-|
|Lesser Peachtree Borer||35.0||48.5||66.0||-||-||-|
*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.
2014 Accumulated Degree Days
|Henderson County|| Polk County
|Codling Moth||Biofix 5/2||1836||1970||2128||Biofix 5/2
|Oriental Fruit Moth||Biofix 4/7||2624||2792||2981
|Tufted Apple Bud Moth||Biofix 4/28
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.
|ORIENTAL FRUIT MOTH:
| TUFTED APPLE BUD MOTH:
2014 Pest Trends (click to enlarge)
UPDATED August 25