Black cutworm traps across Iowa have been capturing migrating moths for several weeks. Pheromone traps are valuable tools in integrated pest management, but they have limitations. The traps only tell you that the insects are in your area; they do not report in which fields the insects have laid their eggs. Where moths lay their eggs will be influenced by environmental and agronomic factors such as weed cover, tillage, the date the crop is planted and previous crop residue, etc. The bottom line is that once adult black cutworms are forecast to be in your area, you must scout your fields to determine if there are larvae present and if they are “cutting” your corn plants. If there is sufficient cutting then controls should be applied.
Iowa State University
Tollefson, Jon J. and Rice, Marlin E., "Black Cutworm Thresholds: What has Changed with the Price of Corn and New Control Methods?" (2008). Integrated Crop Management News. 937.
The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.