WNC Orchard Insect Pest Populations – July 3, 2024

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European red mites on apple leafCodling Moth: As summarized in last week’s update, second generation codling moth is the key concern at this time. Egg laying in the southeast begins between 1400 and 1450 degree days (DD), and as of July 3 DD totals in Henderson and Cleveland County were 1370 and 1717. Ideally a first application has been applied in Cleveland County and similar elevations. In Henderson County and similar elevations, the optimum timing for a first application is July 5 or 6. However, in orchards with very low populations and where only a single application for the second generation is needed, delaying the application to 1600 DD will likely be sufficient.

In orchards using mating disruption and having very low populations, the need for insecticides targeting codling moth are questionable. At most, only a single application is likely necessary.

Brown Marmorated Stink Bug (BMSB): In lower elevation orchards, we are getting closer to the emergence of first generation BMSB adults, which historically is the most damaging time for this pest. First emergence begins at approximately 750 DD. As of July 3, total cumulative DD in Cleveland and Henderson Counties were 632 and 496, respectively. Based on forecasts, BMSB emergence in Cleveland County is predicted to begin in about 10 to 12 days. In Henderson County and similar elevations, it’ll be at least 3 weeks or longer before emergence begins.

European Red Mite (ERM): Typically, orchards that have avoided ERM population build up by about July 7 have a low potential for mite problems the remainder of the year. While mite problems continue to exist in several locations, the threat should become less of an issue over the next week or so. Nonetheless, there are exceptions to the rule, so monitoring populations for the next couple of weeks should continue. It is noteworthy that most orchards that we have visited for mite collections have had good predatory mite populations.

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

2024 Average Weekly Trap Captures

Insects per trap
Jun 19 Jun 24 Jul 2
Codling moth  1.0 0.5 2.0
Oriental fruit moth 18.0 12.0 14.5
Tufted apple bud moth 1.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 0.0 0.0 0.0
Lesser appleworm 0.0 4.0 0.0
Apple maggot (research orchards) 1.0 0.0 0.0
Apple maggot (abandoned orchard) 0.0 2.0 0.0
Brown marmorated stink bug (commercial) 1.0 1.3 0.3
Brown marmorated stink bug (unsprayed research orchard) 1.0 1.0 0.7
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 25.0 31.0 48.0
Peachtree borer 14.0 10.0 1.0
Lesser peachtree borer 14.0 2.0 8.0
San Jose scale 20.0 200.0 165.0

*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.

2024 Accumulated Degree Days

Jun 19 Jun 24 July 2
Codling moth (Biofix: April 15) 1010 1128 1326
Oriental fruit moth (Biofix: March 15) 1614 1756 1994
Tufted apple bud moth (Biofix: April 15) 1320 1462 1700

About degree-day models

2024 Pest Population Trends

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