WNC Orchard Insect Populations for August 22, 2018
With only a few exceptions, apple insect pest pressure continues to decline in commercial orchards across the region. While some new brown marmorated stink bug adults continue to emerge, populations have been very low in the vast majority of apples, as has damage. At this point in the season it is unlikely that BMSB will suddenly increase in numbers in apples. Damage levels continue to be very low, and continued insecticide applications are probably not necessary in most orchards.
Other insect populations are also low, including codling moth and OFM. While apple maggot flies continue to be captured in abandoned orchards, the threat of dispersal to managed orchards is low at this time.
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||17.0||25.7|
|Tufted Apple Bud Moth||1.0||0.0||0.0|
|Apple Maggot (abandoned and research)||21.3||14.3||24.5|
|Brown Marmorated Stink Bug (commercial – mountains)||1.0||1.3||1.8|
|Brown Marmorated Stink Bug (commercial – upper piedmont)||1.8||1.1||2.4|
|Brown Marmorated Stink Bug (research – unsprayed)||1.3||5.2||4.8|
|Spotted Tentiform Leafminer||3.0||0.0||5.0|
|Lesser Peachtree Borer||10.5||3.0||12.5|
|San Jose Scale||5.0||2.5||67.5|
*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||2100||2295||2458|
|Oriental Fruit Moth||Apr 2||2819||3054||3251|
|Tufted Apple Bud Moth||May 4||2500||2735||2932|
|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: