Bui. 866, U. S. Dept. of Agriculture. 



Plate I. 



IIL. 







. ' * 







;-• ^ 



■'•mpiBff^i^i^lpi^. 



;.^i "V" 



Fig. I. — Potato Vines Sprayed with Bordeaux. 3-3-50 (Plat 55), and 

 Unsprayed (Plat 54). 



Fig. 2— Potato Vines Sprayed with Pickering Spray (Left of Stake 43) and 

 Unsprayed Vines (Right of Stake 43). 



