WNC Orchard Insect Pest Populations – August 25, 2021

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Brown marmorated stink bug damage on appleFirst generation adults of the brown marmorated stink bug (BMSB) continue to emerge in all production areas. As shown in the figure below, approximately 80% of adults have emerged in Cleveland County as of 25 August, compared to about 50% in Wilkes County and 40% in Henderson County. As emergence progresses we continue to see pheromone trap captures increase in most areas. With warm weather predicted for the foreseeable future, average trap captures across the region increased from an average of about 5 per trap last week to 12 this week. Expect BMSB pressure to remain intense through September.

Chart showing brown marmorated stink bug emergence

Other Pests: The first Apple Maggot flies on traps at our abandoned site were finally captured during the past week. This is quite late, and only four were detected. Based on the Codling Moth degree-day model, second generation egg laying is nearly complete in Henderson County (2390 DD), while in Cleveland County third generation egg laying is about 23% complete (3035 DD). However, populations are very low and do not pose a threat in the majority of orchards. Oriental Fruit Moth populations are also low in managed orchards, and insecticides applied for stink bugs have contributed to suppression of this pest.


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


2021 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Aug 9 Aug 16 Aug 23
Codling moth  0.5 0.5 0.5
Oriental fruit moth 20.0 17.5 20.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 2.0 1.0 0.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 0.7 0.7 1.3
Brown marmorated stink bug (commercial) 7.5 6.5 12.5
Brown marmorated stink bug (unsprayed) 3.9 4.5 12.1
Spotted tentiform leafminer 0.0 10.0 0.0
Dogwood borer 25.0 33.0 17.0
Peachtree borer 15.0 9.0 20.0
Lesser peachtree borer 15.0 24.0 45.0
San Jose scale 2.5 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

HENDERSON COUNTY
Aug 9 Aug 16 Aug 23
Codling moth (Biofix: April 10)
2000 2175 2342
Oriental fruit moth (Biofix: March 27)
2668 2879 3081
Tufted apple bud moth (Biofix: April 30)
2309 2520 2722

About degree-day models


2021 Pest Trends (click to enlarge)

Chart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trends


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
Updated on Aug 25, 2021
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