WNC Orchard Insect Pest Populations – May 17, 2023

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Insect trap in apple orchardThe codling moth remains the key pest at this time, and relatively warm temperatures during the past week have accelerated degree day (DD) accumulations throughout the region. DD accumulations in lower elevations (e.g., Cleveland, Burke Co.) are at about 550, which coincides with about 80% of first generation moths emerged, and 30% of eggs hatched. This is a time when populations are most intense, and insecticides should be a part of the management program at this time if mating disruption is not being used. In higher elevations (Henderson County), we have reached about 370 DD, which represents 55% adult emergence and 5% egg hatch. Generally, the need for first generation management runs from about 250 to 1000 DDs, with the period between about 350 to 800 most critical.


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


2023 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
May 1 May 8 May 15
Codling moth  0.5 3.0 2.0
Oriental fruit moth 26.0 38.0 29.0
Tufted apple bud moth 9.0 6.0 13.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 3.0
Lesser appleworm
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.0 0.0 0.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 1.0 4.0 27.0
Peachtree borer 0.0 0.0 4.0
Lesser peachtree borer 7.0 7.0 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.


2023 Accumulated Degree Days

HENDERSON COUNTY
May 1 May 8 May 15
Codling moth (Biofix: April 7) 170 220 338
Oriental fruit moth (Biofix: March 24) 433 508 662
Tufted apple bud moth (Biofix: April 21) 80 155 308

About degree-day models


2023 Pest Population Trends

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 trends