The alfalfa weevil is rapidly spreading over the entire alfalfa-growing areas of the western states. Its injury to the alfalfa crop still aggregates an enormous sum annually. This is due to the fact that each year it is extending its attack into new territory. Control measures adopted by the farmers are reducing its injury in the treated fields. Many farmers are now cutting more alfalfa in the weevil-infested districts than before the appearance of this pest because of adopting better cultural methods as outlined in Bulletin No. 110 and Circular 10 of this station. Both of these publications are now out of print.
Hagan, Harold R., "Circular No. 31 - The Alfalfa Weevil (Phytonomus posticus Fab.)" (1918). UAES Circulars. Paper 26.