WNC Orchard Insect Pest Populations – August 2, 2022

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A cluster of apples grow on the end of a branch.First generation brown marmorated stink bug emergence is beginning in Henderson and Wilkes Counties and other locations of similar elevation. Hence, pheromone trap captures should begin to increase next week; trap captures shown in this week’s figures represent last week’s captures. The potential for damage by BMSB will increase over the next few weeks, particularly on cultivars most susceptible to damage. See model predictions below for BMSB adult emergence and the table for insecticides recommended for control.

It is emphasized that BMSB rarely causes damage to early maturing cultivars such as Ginger Gold and Gala, so targeting these varieties with an insecticide for BMSB is probably not necessary. Those cultivars harvested in September are more susceptible, with Granny Smith, Pink Lady, Fuji, and finally Romes most susceptible to injury.

Chart showing insect population trends

Insecticides recommended for brown marmorated stink bug control on apples

Common name Brand name Pre-harvest interval (d)

Rate/Acre

(fl oz)

Maximum fl oz/season
Pyrethroids
  Bifenthrin Brigade 2EC, Fanfare 2EC 14 9.6 28.8
  Beta-cyfluthrin Tombstone 2EC 7 2.4 2.8
  Cyfluthrin Baythroid 1EC 7 2.8 2.8
  Fenpropathrin Danitol 2.4EC 14 21.3 42.6
  Gamma- cyhalothrin Proaxis 0.5EC 14 5.12 20.48
  Lambda-cyhalothrin Warrior II 2.08SC 21 2.56 10.24
  Zeta-cypermethrin Mustang Maxx 0.8EC 14 4.0 24
Neonicotinoids
  Chlothianidin Belay 2.13F 7 6 12
Premixes

  Lambda-cyhalothrin +

chlorantraniliprole

Besiege 21 12 31

Codling moth, oriental fruit moth, and apple maggot

Second generation codling moth is either complete or nearing completion throughout the region. While there is sufficient time for a partial third generation, the potential for damage from this point forward is very low. Third and fourth generation OFM populations begin to overlap at this point in the season and models become less useful. Pheromone trap captures are the best tool for determining the need for insecticide sprays, but populations are generally low in commercial orchards and insecticides applied for BMSB will further suppress OFM.

Finally, the first apple maggot of the year was captured at our abandoned site this past week. While it is not an issue at this time, expect numbers to increase over the next few weeks.


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


2022 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Jul 18 Jul 25 Aug 1
Codling moth  2.0 0.0 0.0
Oriental fruit moth 14.5 9.0 6.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 1.0 0.0
Obliquebanded leafroller 1.0 1.0 0.0
Lesser appleworm 2.0 1.0 0.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.3
Brown marmorated stink bug (commercial) 1.3 1.5 1.2
Brown marmorated stink bug (unsprayed) 2.0 13.5 6.0
Spotted tentiform leafminer 1.0 0.0 0.0
Dogwood borer 0.0 1.0 1.0
Peachtree borer 2.0 2.0 3.0
Lesser peachtree borer 3.0 7.0 4.0
San Jose scale 5.0 0.0 0.0
Ambrosia beetle (all species) 0.3 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.


2022 Accumulated Degree Days

HENDERSON COUNTY
Jul 18 Jul 25 Aug 1
Codling moth (Biofix: April 22) 1643 1821 2020
Oriental fruit moth (Biofix: April 12) 2163 2371 2598
Tufted apple bud moth (Biofix: April 27) 1965 2173 2400

About degree-day models


2022 Pest Trends (click to enlarge)

Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends Chart showing insect population trends