WNC Orchard Insect Pest Populations – July 19, 2022
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As has been the trend for season, codling moth populations remain low throughout the region, with about 31% egg hatch of the second generation complete in Henderson County, and essentially completed in Cleveland County. If codling moth has not been an issue in your orchard to date, it is highly unlikely to become so the remainder of the year. While oriental fruit moth (OFM) has been spotty, populations do tend to increase during August and September. However, in those regions where pyrethroids have been targeted on brown marmorated stink bug (BMSB), OFM will also be controlled.
First generation BMSB adult emergence has begun in Cleveland County and is about 20% complete, so now is an important time for protection of susceptible cultivars. While adult emergence has not yet begun in higher elevations such as Henderson, Wilkes and Haywood counties, recent studies have shown that ‘Granny Smith’ apples become highly attractive to surviving overwintered adults, and an insecticide application before July 30 is likely warranted in locations where populations are high or where there is a history of BMSB damage.
2022 Apple Field Day
Remember that Apple Field Day will occur on July 28 at the Mountain Horticultural Crops Research and Extension Center in Mills River. There are many good presentations scheduled and admission is free!
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2022 Average Weekly Trap Captures
|Insects per trap|
|Jul 5||Jul 11||Jul 18|
|Oriental fruit moth||17.0||10.0||14.5|
|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)||1.3||1.5||1.3|
|Brown marmorated stink bug (unsprayed)||2.5||1.0||2.0|
|Spotted tentiform leafminer||0.0||0.0||1.0|
|Lesser peachtree borer||41.0||45.0||3.0|
|San Jose scale||22.5||12.5||5.0|
|Ambrosia beetle (all species)||1.0||0.5||0.3|
*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
|Jul 5||Jul 11||Jul 18|
|Codling moth (Biofix: April 22)||1320||1478||1643|
|Oriental fruit moth (Biofix: April 12)||1775||1963||2163|
|Tufted apple bud moth (Biofix: April 27)||1577||1766||1965|