During week 3 of the Iowa Moth Trapping Network (April 11 to April 17), our cooperators reported 62 total black cutworm (BCW) and 9 true armyworm (TAW) moths. Cooler conditions recently may have slowed down moth migration into the state, but black cutworm remains the dominant species caught in traps around the state.
Week 3 report:
The 9 TAW moths were captured sporadically across the state (Figure 1). Similarly, black cutworm activity was statewide during week 3 (Figure 2). Of the 62 moths reported, most of them were reported on April 12. One significant flight occurred during week 3 in Mahaska County on April 12. This is in addition to the previously reported significant flight in Mahaska County during week 2 when significant flights occurred in 5 counties. You can read more about what a significant flight means in the Week 2 update.
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).
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: