12 Farmers’ Bulletin 1225. 
A fungus * disease attacks both adults and nymphs. Leafhoppers 
affected with this fungus soon die and turn from green to yellowish in 
color. Ina short time a heavy fungous growth, iridescent in appear- 
ance, 1. e., having colors of the rainbow, appears on the insect’s body 
(fig. 10). Warm, moist weather is necessary for the growth and 
spread of this fungus. In 1919 it was common all over Wisconsin 
and in certain localities practically “wiped out” the leafhoppers. 
In 1920, however, not a single specimen of the fungus was found. 
Spiders often prey on both adults and nymphs. 
Fig. 10.—Fungous disease to check leafhoppers. The fungus has arainbow-like appearance after cover- 
ing body ofthe insect. 
SELECTION FROM RESISTANT VINES. 
Not only are certain varieties of potatoes less severely affected 
with ‘“‘hopperburn” than are others, but some vines of any one 
variety are found to be more resistant to “‘hopperburn” than are 
other vines of the same variety. 
Selections made at digging time of tubers from healthy and badly 
diseased vines when planted the following year gave interesting 
results. Of five varieties used—Early Ohio, Irish Cobbler, Green 
Mountain, Rural New Yorker, and Late Puritan—‘‘hopperburn” 
3 Entomophthora s phaeros perma. 
