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



Plate IX. 



Fig. 1.— Second crop of alfalfa in field treated by "mudding" process. Crop growing well and not 

 seriously damaged by the alfalfa weevil. Photographed June 10, 1911. (Original.) 



Fig. 2. — Condition of untreated fields at time photograph shown in figure 1 was taken. The 

 alfalfa weevils have prevented the second crop from starting. Photograph taken July 10, 

 1911. (Original.) 



Fig. 3.— Patch of first crop left in field shown in figure 1, illustrating how the larvae were dissem- 

 inated from the first crop into the field where the weevil had been killed by the " mudding " 

 process. Photograph taken July 10, 1911 . (Original.) 



Field Experiments Against the Alfalfa Weevil. 



