WNC Orchard Insect Pest Populations – July 19, 2023
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The pest situation is similar to last week, with second generation codling moth egg hatch about 15% complete in Henderson County, and 65% complete in Cleveland County. In those orchards that have low populations and have not experienced damage to date, a single application at this time should be sufficient. In lower elevation orchards in Cleveland County, it is unlikely that additional insecticides will be necessary against codling moth in low population orchards. Insecticides applied for second-generation codling moth should also provide control of third generation OFM, which is in the early stages of laying eggs in Henderson County, and nearly complete in Cleveland County.
Degree-day accumulations for brown marmorated stink bug are considerably behind past years. First generation adults, which cause the majority of damage, begin to emerge at about 750 DD. As of July 18, BMSB DD accumulations in Henderson and Cleveland County were only 444 and 578, compared to 625 and 812 at this time last year, respectively. In addition, BMSB captures in pheromone traps have also been low this year, with a cumulative total catch of only 6 adults per trap at the MHCREC in Mills River, compared to 19.5 and 28.0 on the same date in 2021 and 2022, respectively.
Remember that the Mountain Hort Field Day is on Thursday, August 10, at the Mountain Horticultural Crops Research and Extension Center in Mills River. This field day includes several apple presentations in the research orchards as well as talks on tomatoes, vegetables, specialty crops, and alternative crops. More details are in the MHCREC announcement.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2023 Average Weekly Trap Captures
|Insects per trap|
|July 3||July 10||July 17|
|Oriental fruit moth||16.0||16.0||15.5|
|Tufted apple bud moth||0.0||0.0||0.0|
|Apple maggot (abandoned and research orchards)||0.0||0.0||0.0|
|Brown marmorated stink bug (commercial)||–||–||–|
|Brown marmorated stink bug (unsprayed)||0.3||0.3||1.3|
|Spotted tentiform leafminer||1.0||0.0||0.0|
|Lesser peachtree borer||4.0||3.5||4.0|
|San Jose scale||0.0||0.0||225.0|
*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.
2023 Accumulated Degree Days
|July 3||July 10||July 17|
|Codling moth (Biofix: April 7)||1107||1282||1451|
|Oriental fruit moth (Biofix: March 24)||1672||1882||2086|
|Tufted apple bud moth (Biofix: April 21)||1318||1529||1733|