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Cumulative growing degree days (GDD) since April 1
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U of I recommends cutworm scouting
Large moth flights early last month may mean cutworm problems very soon.
Compiled by staff
Published: May 3, 2012
Growers should begin scouting their emerging corn seedlings for signs of leaf feeding and cutting by black cutworms, according to coordinator of the Illinois Cooperative Agricultural Pest Survey Kelly Estes. Significant moth flights in late March and early April could have caused a significant presence of cutting-stage larvae in many areas of the state in the coming weeks.
Potential cutting dates are determined by using the reports of intense captures (nine or more moths in a one- to two-night trapping period) and calculating degree-day accumulations using historical temperature data. We can expect fourth instar larvae to be present after the accumulation of 300 degree-days.
Estes recommends scouting the cornfields for black cutworm injury and welcomes reports from farmers about their observations. Send your reports to:
kcook8@illinois.edu
.
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