WNC Orchard Insect Pest Populations – July 26, 2022

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Wagon tour in orchard, Mountain Horticultural Crops Research StationWe are approaching the end of second generation codling moth in Henderson County and similar elevations, with egg hatch about 65% complete. Unless there is evidence of problems to date (i.e., some fruit damage or high pheromone trap captures), there is a low potential for damage from this point forward. In Cleveland County and similarly low elevations, the second generation has completed development. While third generation activity is not uncommon in lower elevations, the need for insecticidal control is rare unless population pressure has been high, in which case there would be some evidence of damaged fruit at this time.

The only other insect of potential concern at this time is brown marmorated stink bug, primarily in lower elevation orchards. Model predictions shown below indicate that approximate emergence of first generation adults is almost 40% complete in lower elevations (Cleveland Co.), but has not yet begun in higher elevations such as Henderson and Wilkes Counties. If a pyrethroid insecticide recommended for BMSB has not been applied to susceptible cultivars in lower elevation orchards, one should be considered at this time. Insecticidal control should not be necessary in Wilkes or Henderson County for another couple  of weeks, the exception being Granny Smith apples (as discussed last week).

Chart showing brown marmorated stink bug emergence in 2022

We have still not captured apple maggot flies at either the Mills River research station or at our abandoned site in Henderson County. In recent years apple maggot activity has not begun until the second or third week of August.

2022 Apple Field Day

Finally, remember that Apple Field Day will be held at 4:00 p.m. this Thursday, 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

Insects per trap
Jul 11 Jul 18 Jul 25
Codling moth  0.5 2.0 0.0
Oriental fruit moth 10.0 14.5 9.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 1.0
Obliquebanded leafroller 0.0 1.0 1.0
Lesser appleworm 0.0 2.0 1.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.0
Brown marmorated stink bug (commercial) 1.5 1.3 1.5
Brown marmorated stink bug (unsprayed) 1.0 2.0 13.5
Spotted tentiform leafminer 0.0 1.0 0.0
Dogwood borer 1.0 0.0 1.0
Peachtree borer 20.0 2.0 2.0
Lesser peachtree borer 45.0 3.0 7.0
San Jose scale 12.5 5.0 0.0
Ambrosia beetle (all species) 0.5 0.3 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.

2022 Accumulated Degree Days

Jul 11 Jul 18 Jul 25
Codling moth (Biofix: April 22) 1478 1643 1821
Oriental fruit moth (Biofix: April 12) 1963 2163 2371
Tufted apple bud moth (Biofix: April 27) 1766 1965 2173

About degree-day models

2022 Pest Trends (click to enlarge)

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