WNC Orchard Insect Pest Populations – July 3, 2023

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Leaf with European red mitesIn lower elevation orchards (e.g., Cleveland County and nearby locations), second generation codling moth is at about 12% egg hatch. This coincides with timing of insecticide applications in orchards with low populations and/or very little damage from the first generation. Hence, an insecticide targeting this generation should be considered this week if one has not been recently applied. In those orchards using mating disruption, it is highly unlikely that insecticides are necessary against codling moth.

In higher elevations, such as Henderson County, second generation adults are just beginning to emerge. Based on the forecast, the optimum timing is predicted for about 10-14 days. Again, it is highly unlikely that insecticidal control will be necessary in orchards using mating disruption, but moth capture in pheromone traps should be used as a tool to make this decision.

Resistance Management:  When choosing an insecticide to apply for second generation codling moth, it is important to use a product with a different mode of action than was used during the first generation. The two major classes of insecticides recommended for codling moth are the diamides (Altacor, Exirel, and Verdepryn) and spinosyns (Delegate). Hence, if one of the diamides was used against the first generation, Delegate should be targeted for the second generation. Conversely, if Delegate was used for first generation control, one the diamides should be considered against the second generation. It should be noted that all of these insecticides are also highly effective against oriental fruit moth, the third generation of which is just beginning to emerge in lower elevation orchards.

European red mites continue to be a challenge for many growers, even in some orchards where preventive control was applied earlier in the season. In orchards with relatively high populations, Acramite provides the best knockdown activity. Other products that provide good activity against moderate populations densities (e.g., <10 mites/leaf) include Portal, Nexter, Kanemite and Nealta.

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

2023 Average Weekly Trap Captures

Insects per trap
June 19 June 26 July 3
Codling moth  0.5 0.0 0.5
Oriental fruit moth 17.5 15.0 16.0
Tufted apple bud moth 1.0 1.0 0.0
Redbanded leafroller 0.0 2.0 0.0
Obliquebanded leafroller 2.0 1.0 1.0
Lesser appleworm 0.0 1.0 1.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.0
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.3 0.0 0.3
Spotted tentiform leafminer 0.0 1.0 1.0
Dogwood borer 19.0 15.0 14.0
Peachtree borer 2.0 0.0 12.0
Lesser peachtree borer 1.0 0.0 4.0
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

June 19 June 26 July 3
Codling moth (Biofix: April 7) 829 948 1107
Oriental fruit moth (Biofix: March 24) 1323 1478 1672
Tufted apple bud moth (Biofix: April 21) 970 1124 1318

About degree-day models

2023 Pest Population Trends

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