Bui. 1243, U. S. Dept. of Agriculture 



PLATE XII 



Beneficial Effect of Spraying for the Mexican Bean Beetle 



A, Untreated check plats of beans destroyed by Mexican bean beetle alongside of plats treated 

 with magnesium arsenate, used as a spray; B, same plats as shown in A, one week later, 

 after leaves had dropped; sprayed beans to the left 



