Large late-season migration flights of corn earworm moths were registered for the second week in a row. DATCP’s pheromone trapping network captured 3,357 moths August 23-29, for a cumulative total of 4,668 moths in 15 traps. The monitoring site near Beaver Dam in Dodge County reported a particularly high weekly count of 884 moths.
The recent surge in corn earworm moth activity in the last two weeks signals that the threat to fresh market and processing sweet corn has increased and egg laying is intensifying in fields where green silks are available. Sweet corn growers are encouraged to continue monitoring fields and following DATCP’s corn earworm migration reports through mid-September. Treatment schedules based on nightly corn earworm moth trap catches are available at: Commercial Vegetable Production in Wisconsin (A3422 pg. 278).
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