July 10, 2019
The following article was prepared by Kevin Wanner (MSU Extension Entomologist).
Alfalfa weevil is the key insect pest of alfalfa, causing variable levels of economic damage across Montana each growing season. Montana weevil populations are a bit lower this year with some pockets of economically damaging numbers. With the cool spring weather alfalfa has been out growing the weevil. Weevil development is starting to ccelerate but first bloom and harvesting has also begun, so first harvest should take care of most of the weevil larvae this year. However, we continue to see adult weevils acti...