LEAF-HOPPERS. ULsiit 
Plants infested by many sucking insects of this kind wilted and 
died; it seemed as if a poison was injected by the insect while 
imbibing the fluid food. 
In the genus Empoasca we find a number of species which 
frequent fruit-trees, and for no good purpose. 
Empoasa albopicta Forbes. (The Green Apple Leaf-hopper). 
These insects were exceedingly numerous early in the sum- 
mer of 1900 upon the currant and gooseberry bushes, and caused 
great injury to the leaves, upon the lower surface of which they 
live, sucking the sap. They cause the leaves to become spotted 
with white, in many cases to such an extent that the foliage be- 
came dry and dropped, thus forcing the plant to do extra work 
by producing a new set of leaves. They do not, like the plant- 
lice, cause the leaves to curl. Fig. 122 (Plate III) shows this 
insect; it is also shown upon the leaves of currants on Plate III, 
Fig. 123. 
Fic. 126—Died: crephala mollipes Say. After Osborn. 
A number of insecticides were used; fresh insect powder, 
(pyrethrum), gave the best results, and all the insects reached 
by it were killed. 
Other and very similar species occur upon the foliage of 
apples and other fruit trees. Empoasca mali LeB. is sometimes 
very troublesome to the foliage of the apple. It is the same as 
albopicta Forbs. 
Typhlocyba rose Linn. (The Rose Leaf-hopper). 
This is a very common pest, and sometimes occurs in large 
numbers upon the rose. “Swarms of these insects may be found, 
in various ,stages of growth, on the leaves of the rose-bush, 
through the greater part of the summer, and even in winter, upon 
