Illinois alfalfa producers report widespread alfalfa weevil injury, says Kevin Steffey, University of Illinois entomologist. Alfalfa weevils are feeding in crowns and preventing plant regrowth in the southern part of the state. This type of damage is usually not seen until after first cutting. Damage at or near threshold levels is being reported in other parts of the state as well. Entomologists speculate the weevil larvae dropped to the ground and survived in plant crowns or among crop residue during the early April freeze that killed alfalfa leaves and stems.
Heavy weevil feeding that requires treatment has been identified in at least 11 northeastern Nebraska fields, including in Cuming County and near Plainview. According to University of Nebraska entomologists, if feeding damage is visible in the northeastern counties, it's probably visible in much of the rest of the state where alfalfa is grown.