Bui. 68, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate IV. 



Trees Defoliated by Spring Canker-worms and Effects of Treatments. 



FiK. 1.— Dcl'oliatod trocs in Ln|ii(m oivliuni. Kij,'. -J.— The .-aiuo trcesa year later. Fig. :!.— Defo- 

 liated trees in the I'nreell (iiihard. Kig. L— An adjaeent row of trees proteeted by two appli- 

 eations of arsenate of lead. (Original.) 



