WNC Orchard Insect Pest Populations – June 8, 2021

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Apple tree shoots damaged by potato leafhopperCodling moth degree-day accumulations range from about 630 in Henderson County to approximately 960 DD in Cleveland County. At this stage codling moth remains a potential threat in Henderson County and locations with a similar or higher elevation (≥ 2000 ft), while in lower elevations (Cleveland/Lincoln Co) first generation flight is nearly complete.

In locations where tufted apple bud moth is a concern, the window of opportunity for control will be nearing an end in lower elevations, while in orchards above 2000 ft the window will remain open for at least 7 to 10 days.

Second generation oriental fruit moth flight is underway in most regions, but typical of this generation, numbers are very low.

Mid-June is prime time for green apple aphids, potato leafhopper, and European red mite, so monitoring for these pests is important at this time.


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


2021 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
May 24 Jun 1 Jun 7
Codling moth  5.5 3.5 0.0
Oriental fruit moth 7.0 6.0 13.0
Tufted apple bud moth 22.0 28.0 14.0
Redbanded leafroller 0.0 0.0 1.0
Obliquebanded leafroller 8.0 18.0 35.0
Lesser appleworm 12.0 9.0 4.0
Apple maggot (abandoned and research orchards) set 0.5 0.0
Brown marmorated stink bug (commercial) 2.0 1.7 1.8
Brown marmorated stink bug (unsprayed) 0.5 0.5 1.5
Spotted tentiform leafminer 0.0 3.0 0.0
Dogwood borer 21.0 21.0 54.0
Peachtree borer 0.0 0.0 5.0
Lesser peachtree borer 42.0 42.0 51.0
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
May 24 Jun 1 Jun 7
Codling moth (Biofix: April 10)
395 523 632
Oriental fruit moth (Biofix: March 27)
681 849 988
Tufted apple bud moth (Biofix: April 30)
323 490 629

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