408 



FRUIT INSECTS 



The Grape Leaf-hopper 

 Typhlocyha co7nes Say 



The grape leaf-hopper is our most common and widespread 

 insect pest of the grape-vine. Practically every vineyard in 

 the United States and Canada is infested by the insect, and 



Fui. 'Ao'.i. — Adults of till Lcriipc Icaf-hoppor. 



almost every year it occurs in injurious numbers in one or more 

 localities. It has its periods of great destructiveness and of 

 comparative obscurity, or its ups and downs, like most of our 

 insect pests. Serious outbreaks occurred in New York in 1901 

 and 1902, and again in 1911 to 1912. Quayle states that with the 

 exception of the phylloxera it is the most destructive insect pest of 



