WNC Orchard Insect Pest Populations – August 31, 2021

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Brown marmorated stink bug trapBrown marmorated stink bug adult emergence continues across all apple production areas, ranging from about 40% complete in Henderson County to almost 90% in Cleveland County. Pheromone trap captures also increased by more than two-fold during the past week in Henderson County, indicative of the increasing populations. Across 9 different locations in Henderson County, trap captures averaged about 26 per trap. In Cleveland County, trap captures remained steady at about 12 per trap. Continued protection of apples that are at least 10 to 14 days from harvest is recommended. Check the list of BMSB recommended insecticides for preharvest intervals.

Brown marmorated stink bug population chart


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


2021 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Aug 16 Aug 23 Aug 31
Codling moth  0.5 0.5 0.0
Oriental fruit moth 17.5 20.0 54.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 1.0 0.0 0.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 0.7 1.3 2.7
Brown marmorated stink bug (commercial) 6.5 12.5 29.5
Brown marmorated stink bug (unsprayed) 4.5 12.1 28.0
Spotted tentiform leafminer 10.0 0.0 0.0
Dogwood borer 33.0 17.0 33.0
Peachtree borer 9.0 20.0 18.0
Lesser peachtree borer 24.0 45.0 31.0
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

HENDERSON COUNTY
Aug 16 Aug 23 Aug 31
Codling moth (Biofix: April 10)
2175 2342 2934
Oriental fruit moth (Biofix: March 27)
2879 3081 3293
Tufted apple bud moth (Biofix: April 30)
2520 2722 2934

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 Sep 1, 2021
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