WNC Orchard Insect Populations for June 19, 2018
We are currently in that time period where we are at the lowest risk for damage by direct insect pests. We are between generations of codling moth and TABM, nearing the end of second-generation OFM (which is typically of little threat), and about a month before apple maggot emergence begins.
At this time, orchards should be scouted for several indirect pests, including apple aphid, potato leafhopper and European red mite. For aphids and leafhoppers, several neonicotinoids or closely related products are highly effective, including Admire (imidacloprid), Actara, Assail, Closer and Sivanto.
Looking ahead, second generation codling moth adult emergence should begin in lower-elevation orchards in the next seven to 10 days.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2018 Average Weekly Trap Captures*
|Insects per trap|
|Oriental Fruit Moth||13.0||16.0||15.7|
|Tufted Apple Bud Moth||11.0||1.0||1.0|
|Brown Marmorated Stink Bug (commercial – mountains)||1.7||1.5||0.5|
|Brown Marmorated Stink Bug (commercial – upper piedmont)||2.0||0.7||1.0|
|Brown Marmorated Stink Bug (research – unsprayed)||2.0||2.5||2.3|
|Spotted Tentiform Leafminer||0.0||40.0||12.0|
|Lesser Peachtree Borer||20.5||42.5||15.0|
|San Jose Scale||0.0||7.5||12.5|
*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.
2018 Accumulated Degree Days
|Codling Moth||Apr 30||654||797||936|
|Oriental Fruit Moth||Apr 2||1071||1249||1418|
|Tufted Apple Bud Moth||May 4||752||929||1099|
|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: