WNC Orchard Insect Populations for April 24, 2018
On the research station, oriental fruit moth trap captures remain close to 100 per trap in apples, while codling moth and tufted apple bud moth are still zero. OFM degree days were 171 in Mills River on April 23rd. Brown marmorated stink bug adults are beginning to appear on traps in both the piedmont and mountains.
A detailed summary of petal fall considerations was posted last week (April 17th) and can be viewed here by scrolling down to “Previous Updates.”
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2018 Average Weekly Trap Captures*
|Insects per trap|
|Oriental Fruit Moth||60.0||100.0||90.0|
|Tufted Apple Bud Moth||0.0||0.0||0.0|
|Brown Marmorated Stink Bug (commercial – mountains)||0.0||0.0||0.0|
|Brown Marmorated Stink Bug (commercial – upper piedmont)||0.0||0.3||0.3|
|Brown Marmorated Stink Bug (research – unsprayed)||0.0||0.0||0.3|
|Spotted Tentiform Leafminer||0.0||5.0||0.0|
|Lesser Peachtree Borer||0.0||0.0||0.0|
|San Jose Scale||0.0||0.0||0.0|
*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.
2018 Accumulated Degree Days
|Oriental Fruit Moth||Apr 2||39||103||171|
|Tufted Apple Bud Moth||–||–||–||–|
|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: