2021 Iowa Moth Trapping Network Update: Week 6

May 12, 2021 2:03 PM
Blog Post

Black cutworm remains the dominant moth species captured by cooperators in our trapping network. During Week 6 of the Iowa Moth Trapping Network, our cooperators reported 73 total black cutworm (BCW) and 34 true armyworm (TAW) moths.

Week 6 report:

The TAW moths reported during Week 6 were captured mostly in the southern half of the state (Figure 1), while BCW activity was statewide (Figure 2). Most of the moths were reported on May 3 or May 4. One potentially significant flight of BCW occurred in Dubuque County on May 3.

You can read more about what a significant flight means in the Week 2 update. We predicted cutting dates for black cutworm in corn based on significant flights that had occurred until Week 5.

TAW reports May 2 to May 8 2021
Figure 1. True armyworm moth captures from May 2 to May 8. The bold number indicates the total moth count for the week, while the smaller number in parentheses is a running total of the moth count for the season; highlighted counties without bold numbers indicate that traps are placed but no reports have been received. Some counties have multiple sites; therefore, data is only reported for the site with the highest count during the week. Data is current as of May 12, 2021.

BCW reports May 2 to May 8 2021
Figure 2. Black cutworm moth captures from May 2 to May 8. The bold number indicates the total moth count for the week, while the smaller number in parentheses is a running total of the moth count for the season; highlighted counties without bold numbers indicate that traps are placed but no reports have been received. Some counties have multiple sites; therefore, data is only reported for the site with the highest count during the week. Data is current as of May 12, 2021.

These updates are typically a week behind. If you are interested in staying up-to-date on the moth trapping network, visit https://corn.ipmpipe.org/insects/ to see live mapping from Iowa, Wisconsin, and Illinois. The true armyworm and black cutworm pages feature 1) an interactive map showing the total count for the current 7-day window – clicking on a county will show you a line graph of trap captures, and 2) a time-lapse map of counts for the entire season. The black cutworm page also has a map that I will update with predicted cutting dates (note: this map is not real-time).

Follow these links to see the reports from Week 1, Week 2, Week 3, Week 4, and Week 5.  

Surrounding states also monitor and report BCW and TAW 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:

Author: 

Ashley Dean Education Extension Specialist I

Ashley is an education extension specialist for field crop entomology at Iowa State University. She coordinates the Iowa Moth Trapping Network, develops educational resources for field crop pests in Iowa, and aids in the research efforts of the