PLATE VIII 
Phytophthora infestans: Infection of potato plots 
Fig. i.—A comer of the plots where infected seed potatoes were planted. An epi¬ 
demic originated from shoots which became infected through the parent tuber. The 
four rows of potatoes that still remain standing were of a resistant variety. 
Fig. 2.—The area within the white lines shows a spot where infection is much more 
prevalent than in the surrounding plants. This spot functioned as a center for the 
development of an epidemic of late-blight in this field. 
