WNC Orchard Insect Pest Populations – May 17, 2022

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Codling Moth, European Red Mite

Codling moth remains the key pest that poses a threat to apples. This is also a time to consider a preventive miticide application for those using this approach in specific orchards or cultivars.

Mountain Horticultural Crops Research Station apple orchardCodling Moth

Egg hatch degree-day models range from about 300 DD in Henderson County to about 440 DD in lower-elevation Cleveland County. In Henderson County, this week is optimum timing for an initial insecticide in orchards with historically low population densities. In orchards with moderate to high populations of codling moth, last week was optimum timing for the first insecticide application. In orchards using mating disruption, it is doubtful that an insecticide is necessary unless pheromone traps are consistently capturing moths.

In orchards at lower elevations where DD accumulations are greater than 400, applications at this time should be based on intensity of moth captures in pheromone traps. If there is no trapping being conducted, it would be wise to assume populations are high and to make a total of 3 applications at 2-week intervals during the first generation. In lower-elevation orchards using mating disruption for codling moth, it is recommended that a single insecticide be applied against the first generation codling moth. This application should coincide with tufted apple bud moth DD accumulations reaching about 800, which is expected to occur next early next week.

Preventive Control of European Red Mite

In orchards with a history or European red mite problems, several options are available for preventive control that usually provides season-long suppression. These include Apollo, Savey, Zeal, Envidor and Agri-Mek. For resistance management purposes, rotate products with different modes of action annually. Apollo and Savey are the same mode of action (MOA group 10A), so do not use either of these in successive years. Agri-Mek should be applied at petal fall to first cover, and either a horticultural oil or penetrating adjuvant should be used to maximize uptake by leaves – if using oil do not use within 14 days of using Captan.

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

2022 Average Weekly Trap Captures

Insects per trap
May 2 May 9 May 16
Codling moth  12.0 4.0 2.0
Oriental fruit moth 12.0 9.0 3.0
Tufted apple bud moth 7.0 16.0 18.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 0.0
Lesser appleworm 0.0
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 1.0 0.0 0.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 0.0 7.0 38.0
Peachtree borer 0.0 0.0 0.0
Lesser peachtree borer 45.0 33.0 18.0
San Jose scale 0.0 0.0 0.0
Ambrosia beetle (all species) 2.3 1.3 2.0

*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.

2022 Accumulated Degree Days

May 2 May 9 May 16
Codling moth (Biofix: April 22) 104 200 296
Oriental fruit moth (Biofix: April 12) 260 390 519
Tufted apple bud moth (Biofix: April 27) 62 193 321

About degree-day models

2022 Pest Trends (click to enlarge)

Chart showing insect population trendsChart showing insect 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