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Updated: October 12, 2017
Corn earworm adult moth.
Many additional sites are above a 4-5, or 5-6, day spray threshold for CEW. Corn earworm (CEW) counts continued to spike, reaching to a 3-4 day thresholds in Erie, Lycoming, Washington, Westmoreland, and York Counties in the last week or two. Many additional sites along the west, south, and eastern portions of PA advanced to a 4-5 day spray interval. Eggs take about 2-3 days to hatch, and1st instar larvae an additional 2-3 days to move into the ear if you have a tight-husked cultivar. Therefore, if you are within 4-6 days to harvest, there is no need to use sprays to prevent CEW larvae in the ear.
European corn borer (ECB) counts are high in Luzern County. All other sites are low.
Fall armyworm (FAW) counts are high in Erie County, and increased also occurred south of Pittsburgh and in Lycoming County.
Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase.
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