The week of May 11 – May 17, 2025 was another relatively quieter week for both black cutworm and true armyworm moth across the state.
A total of 33 black cutworm (BCW) moths were reported last week, with no significant flights being reported. As a reminder, now is the time to be scouting for black cutworm based on our predicted cutting dates from significant flights from earlier this spring combined with growing degree days.
Figure 1 below shows where moth traps are established throughout Iowa and summarizes black cutworm moth trap captures by county.
For true armyworms, 20 total moths were reported over the last week. Figure 2 below shows where the traps are established, and true armyworm moth trap captures by county.
Follow the links to see the first, second, third, and fourth moth trapping network updates for 2025. You can also track moth flights, black cutworm significant flights, and projected cutting dates for Iowa, Illinois, and Wisconsin on https://corn.ipmpipe.org/insects/. Iowa’s data is now included on this website!
Surrounding states also monitor and report black cutworm and true armyworm captures. If you live near the state border, it may be beneficial to check these resources periodically. More resources may be available than what is listed here:
Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on May 18, 2025. The information contained within may not be the most current and accurate depending on when it is accessed.
- Field Agronomist in EC/SE Iowa