|Monitor for looper worms. Photos by Jack Kelly Clark|
|Keep an eye out for alfalfa caterpillars in the fields.|
Combine monitoring of armyworms with monitoring for alfalfa caterpillar as described in Alfalfa Caterpillar and Armyworm Monitoring. Count and record the number of healthy and parasitized caterpillars caught in your sweep net on a monitoring form .
If cutting is not practical or not scheduled soon after monitoring, treat if there is an average of 10 or more nonparasitized alfalfa caterpillars (those not infected by parasites) per sweep, 15 or more nonparasitized armyworms per sweep, or 10 or more nonparasitized alfalfa caterpillars and armyworms combined per sweep.