Bui. 112, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate V. 





Fig. 1. — Street sweeper in operation on alfalfa field after first crop was removed. Larvae and pupae 

 were crushed by the rotary brush. Photographed June 14, 1911. (Original.) 



Fig. 2. — Second crop ready to cut in the field on which street sweeper was used June 14, 1911. Good 

 stand and good crop. Photographed July 27, 1911. (Original.) 



Fig. 3. — Second crop of alfalfa growing on field where no treatment was given. Crop short and about 

 two weeks behind that of the field shown in figure 2. Photographed July 27, 1911. (Original.) 



Field Experiments Against the Alfalfa Weevil. 



