PLATE XXXVII 



Fig. I, 2, 3. — Stem-end and lenticel blackrot produced by spraying the growing 

 tubers with a spore suspension of Fusarhtm radicicola. Idaho Rural potato tubers. 

 Fiel^ inoculations. 



Fig. 4. — Eye infection produced by spraying the growing tuber with a spore sus- 

 pension of F. radicicola. Netted Gem tuber. Field inoculation. 



Fig. 5, 6, 7. — Stem-end blackrot produced by the inoculation of the stolons of 

 growing Idaho Rural tuber. Field inoculation. 



Fig. 8. — Stem-end rot of Netted Gem tuber produced by inoculating the stolon of 

 the growing tuber. 



36290°— IG 2 



