WNC Orchard Insect Pest Populations – June 23, 2020

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InsectsWe are currently in a lull of direct pest activity throughout the western apple region. Codling moth degree-day (DD) accumulations have reached about 800 and 1250 in Henderson and Cleveland/Lincoln Counties, respectively. First-generation adult emergence is essentially complete in orchards at elevations of ~2100 ft, and in lower elevations (<800 ft) second-generation adult emergence is predicted to begin in about a week.

Tufted apple bud moth cumulative DDs are about 1,000, so there is still time to make an insecticide application for this pest if one has not been made in the past couple of weeks.

Second generation oriental fruit moth flight is also nearing completion, with low trap captures in orchards we’ve been monitoring.

Curative applications of insecticides/miticides for control of aphids, leafhoppers, or European red mites is the main concern at this time. However, overall populations remain low in most orchards, so be sure to scout orchards for these pests to determine the need for an insecticide.


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


2020 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Jun 8 Jun 15 Jun 22
Codling moth  0.4 0.3 0.0
Oriental fruit moth 1.1 2.6 1.6
Tufted apple bud moth 27.0 23.0 2.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 20.0 14.0 2.0
Lesser appleworm 8.0 0.0 0.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.0
Brown marmorated stink bug (commercial) 1.5 1.1 0.8
Brown marmorated stink bug (unsprayed) 5.0 4.3 1.5
Spotted tentiform leafminer 10.0 0.0 24.0
Dogwood borer 58.0 36.0 9.0
Peachtree borer 0.0 3.0 5.0
Lesser peachtree borer 68.0 54.0 41.0
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.


2020 Accumulated Degree Days

HENDERSON COUNTY
Jun 8 Jun 15 Jun 22
Codling moth (Biofix 4/20) 541 DD 678 DD 778 DD
Oriental fruit moth (Biofix 3/30) 938 DD 1111 DD 1246 DD
Tufted apple bud moth (Biofix 4/27) 680 DD 853 DD 988 DD

About degree-day models


2020 Pest Trends (Click to Enlarge)

Graph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trendsGraph of insect population trends Graph of insect population trends Graph of insect population trends Graph of insect population trends Graph of insect population trends


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