The black cutworm is an occasional pest of corn, yet it deserves our attention because of its potential for causing economic damage. Two significant flights of black cutworm adults (moths) were observed in southern Iowa on April 6 and 7 and again a week later. Trap catches indicate that eggs may have been laid in Iowa fields. Trap catch data were reported from cooperators in Iowa State University Extension's pheromone trap network. Black cutworms require 300 base 50°F degree days for larvae to be large enough to cut corn plants, so by calculating cutworm hatch and development over time, we can anticipate when to look for damage.
Iowa State University
Rice, Marlin E. and Pope, Richard O., "Early cutworm scouting for southern Iowa" (2001). Integrated Crop Management News. 1857.
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