WNC Orchard Insect Pest Populations – July 19, 2022

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Brown marmorated stink bug adultAs has been the trend for season, codling moth populations remain low throughout the region, with about 31% egg hatch of the second generation complete in Henderson County, and essentially completed in Cleveland County. If codling moth has not been an issue in your orchard to date, it is highly unlikely to become so the remainder of the year. While oriental fruit moth (OFM) has been spotty, populations do tend to increase during August and September. However, in those regions where pyrethroids have been targeted on brown marmorated stink bug (BMSB), OFM will also be controlled.

First generation BMSB adult emergence has begun in Cleveland County and is about 20% complete, so now is an important time for protection of susceptible cultivars. While adult emergence has not yet begun in higher elevations such as Henderson, Wilkes and Haywood counties, recent studies have shown that ‘Granny Smith’ apples become highly attractive to surviving overwintered adults, and an insecticide application before July 30 is likely warranted in locations where populations are high or where there is a history of BMSB damage.Chart showing brown marmorated stink bug emergence for 2022

2022 Apple Field Day

Remember that Apple Field Day will occur on July 28 at the Mountain Horticultural Crops Research and Extension Center in Mills River. There are many good presentations scheduled and admission is free!


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


2022 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Jul 5 Jul 11 Jul 18
Codling moth  0.0 0.5 2.0
Oriental fruit moth 17.0 10.0 14.5
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 1.0
Lesser appleworm 0.0 0.0 2.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.0
Brown marmorated stink bug (commercial) 1.3 1.5 1.3
Brown marmorated stink bug (unsprayed) 2.5 1.0 2.0
Spotted tentiform leafminer 0.0 0.0 1.0
Dogwood borer 1.0 1.0 0.0
Peachtree borer 12.0 20.0 2.0
Lesser peachtree borer 41.0 45.0 3.0
San Jose scale 22.5 12.5 5.0
Ambrosia beetle (all species) 1.0 0.5 0.3

*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.


2022 Accumulated Degree Days

HENDERSON COUNTY
Jul 5 Jul 11 Jul 18
Codling moth (Biofix: April 22) 1320 1478 1643
Oriental fruit moth (Biofix: April 12) 1775 1963 2163
Tufted apple bud moth (Biofix: April 27) 1577 1766 1965

About degree-day models


2022 Pest Trends (click to enlarge)

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

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 Jul 19, 2022
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