The Watch for Black Cutworms Will Intensify

April 14, 2000
We continue to receive scattered reports of captures of black cutworm males in pheromone traps as the moths make their way into Illinois. As the rate of corn planting picks up speed and the dates of corn emergence approach, we will need to be prepared for the potential occurrence of cutworm injury. Within the next 2 weeks, we will begin to project dates when you can anticipate cutting damage by black cutworm larvae. The model we use indicates that cutting may occur when 300 heat units (above a base temperature of 50°F) have accumulated after an "intense" capture of black cutworm adults (eight or nine moths captured in one or two nights). As these projected dates for cutting get closer, begin scouting fields for signs of their injury.--Kevin Steffey

Author: Kevin Steffey