WNC Orchard Insect Pest Populations – June 21, 2022
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Codling Moth: Second generation codling moth is beginning to emerge in Cleveland County and similar elevations (about 800 to 1000 ft), while at higher elevations we remain between generations. Insecticide use at this time should not be necessary in the majority of orchards in Henderson or Wilkes Counties.
Codling moth DD accumulations in Cleveland County are about 1260. While pheromone trap captures are the best indicator of activity, in orchards with low populations (i.e., no damage by first generation larvae and low pheromone trap captures), a single application timed at about 1400 DD is often sufficient for second-generation control. When choosing an insecticide to use for second generation codling moth, remember to use a product that was not used during first generation flight. In orchards using mating disruption, it is highly unlikely that insecticides are necessary for second generation codling moth.
Oriental Fruit Moth: We are in the midst of second generation flight in higher elevation orchards (Henderson and Wilkes), while second generation flight is essentially complete in lower elevation orchards. Generally second generation OFM poses little threat to apples, but trap captures have been high in several orchards this season, especially those that have not used mating disruption for several years.
Secondary Pests (Mites, Aphids, Leafhoppers): With hot temperatures returning, European red mite obviously remains a threat in many orchards. To date, aphid and leafhopper populations have been very low on apples, but keep an eye out for them as they do remain a threat.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2022 Average Weekly Trap Captures
|Insects per trap|
|Jun 6||Jun 13||Jun 20|
|Oriental fruit moth||4.5||23.0||19.0|
|Tufted apple bud moth||3.0||1.0||0.0|
|Apple maggot (abandoned and research orchards)||set||0.0||0.0|
|Brown marmorated stink bug (commercial)||–||–||–|
|Brown marmorated stink bug (unsprayed)||2.5||1.5||3.0|
|Spotted tentiform leafminer||0.0||4.0||0.0|
|Lesser peachtree borer||9.0||14.0||30.0|
|San Jose scale||0.0||0.0||0.0|
|Ambrosia beetle (all species)||3.0||0.8||3.0|
*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
|Jun 6||Jun 13||Jun 20|
|Codling moth (Biofix: April 22)||666||800||974|
|Oriental fruit moth (Biofix: April 12)||994||1162||1359|
|Tufted apple bud moth (Biofix: April 27)||796||964||1161|