Alfalfa growers are encouraged to carefully examine new tender growth for signs of alfalfa weevil feeding.
Both adults and larvae feed on alfalfa foliage, but the larvae cause the majority of the damage, says Phil Kaatz with Michigan State University Extension.
Alfalfa weevil adults and larvae have the potential to prevent or slow regrowth by feeding on the new shoots. Adults also feed on the sides of alfalfa stems.
"Control may be warranted after a cutting when larvae and adults are feeding on more than 50 percent of the crowns and regrowth is prevented for three to six days," Kaatz says.
Source: Phil Kaatz, Michigan State University Extension