WNC Orchard Insect Populations for August 28, 2018
With the exception of brown marmorated stink bug, insect populations are low throughout the region. Codling moth and OFM populations remain low in the vast majority of sites we’re monitoring, and apple maggot trap captures declined drastically during the past week.
BMSB does remain a potential threat to late-maturing fresh market apples. This is of greatest concern in higher elevations (>1500 ft) where first-generation BMSB adults are still emerging. An insecticide application should be considered over the next week or so on fresh market culivars that won’t be harvested until after mid-September.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2018 Average Weekly Trap Captures*
|Insects per trap|
|Oriental Fruit Moth||17.0||25.7||29.0|
|Tufted Apple Bud Moth||0.0||0.0||0.0|
|Apple Maggot (abandoned and research)||14.3||24.5||4.0|
|Brown Marmorated Stink Bug (commercial – mountains)||1.3||1.8||2.2|
|Brown Marmorated Stink Bug (commercial – upper piedmont)||1.1||2.4||3.3|
|Brown Marmorated Stink Bug (research – unsprayed)||5.2||4.8||8.4|
|Spotted Tentiform Leafminer||0.0||5.0||0.0|
|Lesser Peachtree Borer||3.0||12.5||37.0|
|San Jose Scale||2.5||67.5||212.5|
*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||2295||2458||2595|
|Oriental Fruit Moth||Apr 2||3054||3251||3424|
|Tufted Apple Bud Moth||May 4||2735||2932||3105|
|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: