Insect Alert For

Black Cutworm

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Alert Details

Black cutworm migration risks will be on the increase especially through the middle of the week as a rather strong and somewhat slow-moving low pressure system moves through the corn-growing region. At this point in the growing season, the primary area of concern for any potential black cutworm moth flights is across the northern areas as corn may still be at a stage where black cutworm moth flights that occur now could result in larvae especially in June that could cause damage to newly-emerged corn. Low risks are predicted in an increasingly south to southwest wind flow regime tonight into tomorrow morning from central Nebraska east into Iowa and northwest Illinois as well as north into eastern South Dakota, southern and central Minnesota, and southwest Wisconsin. The risk area shifts east into the southern Great Lakes tomorrow night and focuses mainly east of I-35. By Wednesday night into Thursday morning, as a cold front begins to advance southeast through the corn-growing region, south to southwest winds are expected to persist and may actually be stronger especially into the southern Great Lakes region. As a result, Moderate black cutworm migration risks are predicted from Wisconsin east into lower Michigan and southern Ontario, Canada with Low risks from I-35 east into the eastern Great Lakes region. No additional risks are predicted after the cold front pushes mostly to the southeast of the primary corn-growing region by late week. Growers all across the corn-growing region, even if not included in a risk, should monitor newly-emerged corn as numerous black cutworm flights have occurred over the last two months especially across the central and eastern corn-growing region and larvae may be more of a threat this year than in the past.