WNC Orchard Insect Pest Populations – September 14, 2021

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Last Pest Update of 2021 and BMSB Still Reigns!

Brown marmorated stink bug damage on appleFor all practical purposes, brown marmorated stink bug remains the only pest of apples throughout the region. You have probably noticed many beginning to disperse to buildings, cars, and other structures, which is a response to declining day length and an effort to locate overwintering sites. However, before they enter overwintering sites they need to consume food to build up fat reserves to survive the winter, and apples remain an ideal food source. While much of the population has completed emergence in lower elevation sites (i.e., Cleveland County), approximately 25% and 45% of first-generation adults have yet to emerge in Wilkes and Henderson County, respectively. As these adults emerge and seek food, apples will remain at risk, especially highly susceptible cultivars such as Granny Smith and Pink Lady. Hence, control may still be necessary on apples that will not be harvested until October.

This will be the last Apple Pest Update of 2021. Our sense is that it was a relatively cool year with fairly low pest pressure – other than late-season BMSB populations. Hopefully, the remainder of harvest runs smoothly with no problems.

Learn more about southeastern apple insect pests at the Apple Insect Management page.

2021 Average Weekly Trap Captures

Insects per trap
Aug 31 Sep 7 Sep 13
Codling moth  0.0 0.0 0.0
Oriental fruit moth 54.0 43.0 34.0
Tufted apple bud moth 0.0 0.0 1.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 1.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 2.7 1.3 0.3
Brown marmorated stink bug (commercial) 28.0 25.0 23.8
Brown marmorated stink bug (unsprayed) 29.5 41.0 46.5
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 33.0 21.0 20.0
Peachtree borer 18.0 17.0 3.0
Lesser peachtree borer 31.0 24.0 8.0
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.

2021 Accumulated Degree Days

Aug 31 Sep 7 Sep 13
Codling moth (Biofix: April 10)
2519 2685 2781
Oriental fruit moth (Biofix: March 27)
3293 3498 3631
Tufted apple bud moth (Biofix: April 30)
2934 3139 3272

About degree-day models

2021 Pest Trends (click to enlarge)

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Visit WNC Orchard Insect Populations for archived posts.

Additional Resources

Written By

Jim Walgenbach, N.C. Cooperative ExtensionDr. Jim WalgenbachProfessor & Extension Entomology Specialist (Fruits / Vegetables) Call Dr. Jim Email Dr. Jim Entomology & Plant Pathology
NC State Extension, NC State University
Posted on Sep 14, 2021
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