8 Farmers’ Bulletin 1225. 
Observations made in Wisconsin have shown that whenever 
leafhoppers were present in potato fields ‘““hopperburn” could be 
found, and when no leafhoppers were present no ‘‘hopperburn” 
could be found. 
Fic. 6.—Presence of many ‘‘hoppers” means ‘‘hopperburn.” Triumph potatoes growing in field, 
covered with large cage containing leafhoppers for entire season. A, Condition of plants on August 
14; B, condition of same plants when dug on September 2. Compare with figure 7. 
HOW “HOPPERBURN”’ AFFECTS DIFFERENT VARIETIES. 
Leafhoppers placed on Early Triumph plants growing in a field 
and covered with a large cage caused “hopperburn”’ which killed 
the plants in 23 days (fig. 6, A and B). ‘“‘Hoppers” placed on 
