WNC Orchard Insect Pest Populations – June 6, 2023
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June 6, 2023
In Henderson County and similar elevations, first generation codling moth is still a potential threat. With about 650 DD accumulating since biofix, the model predicts >80% emergence of adults and 40% egg hatch of the first generation. Overall, populations thus far have been quite low, and the threat of populations suddenly increasing is unlikely in locations where they’ve been low to date. In lower elevations, the first generation is nearly complete and we are past the period of greatest concern.
Second generation oriental fruit moth emergence is underway throughout the region, but as mentioned last week, the second generation poses low risk if good control of the first generation was achieved.
Tufted apple bud moth egg hatch is just beginning in Henderson County and similar elevations, while it is nearly 20% complete in Cleveland County. The window for timing of insecticide applications for control of the first generation will begin later this week in Henderson County and remain open for the next couple of weeks. TABM is generally less of a problem in lower elevation orchards, but in those locations where it is a concern, an insecticide application anytime between last week and the next 10 days will provide excellent control.
To date, populations of green apple aphids and potato leafhopper have been very low, but we are in that time period when populations often begin to increase. Hence, scouting for these pests, along with European red mite, should intensify over the next few weeks.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
|Insects per trap|
|May 22||May 30||June 6|
|Oriental fruit moth||11.0||6.0||10.5|
|Tufted apple bud moth||50.0||75.0||14.0|
|Apple maggot (abandoned and research orchards)||0.0||0.0||0.0|
|Brown marmorated stink bug (commercial)||–||–||–|
|Brown marmorated stink bug (unsprayed)||0.0||1.0||1.0|
|Spotted tentiform leafminer||0.0||0.0||0.0|
|Lesser peachtree borer||14.0||2.0||2.0|
|San Jose scale||0.0||0.0||0.0|
*Note that these averages illustrate only the timing of insect emergence and fluctuations in populations, and are not representative of population levels in any given orchard. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.
2023 Accumulated Degree Days
|May 22||May 30||June 6|
|Codling moth (Biofix: April 7)||443||525||623|
|Oriental fruit moth (Biofix: March 24)||801||922||1050|
|Tufted apple bud moth (Biofix: April 21)||448||569||697|