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



Plate II. 



Fig. I. — Potato Vines Sprayed with Bordeaux, 5-5-50 (Plat B), and with 

 Pickering Spray (Plat I). 



Fig. 2. — Potato Vines Sprayed with Barium-Water Spray (Plat 59) and 

 Unsprayed (Plat 58). 



