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The Potato Leafhopper and Its Control. 9 
Karly Ohio vines under the same conditions caused ‘“hopperburn”’ 
which killed the plants in about 40 days. Similarly ‘hopperburn”’ 
killed Irish Cobbler plants in about 55 days and Rural New Yorker 
Fic. 7.—Absence of numbers of leafhoppers means no “hopperburn.”? Triumph potatoes growing: 
in field, covered with large cage for entireseason and kept free ofleafhoppers. A , Condition of plants 
on August 14; B, condition of same plants when dug on September 2. Compare with figure 6. 
plants in about 50 days. Green Mountain plants under like condi- 
tions became badly diseased, but were still alive two months after 
the leafhoppers were placed on them. 
