Bui. 866, U. S. Dept. of Agriculture. 
Plate I 
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). 
