ROSE-CHAFERS 



247 



The larva folds the leaf over and fastens it with the web. From 

 this house it does its feeding. If the attack is not serious the larva 

 may be crushed by hand or the leaves picked off and burned. 

 Where the attack is more serious, spraying with poisons is advised. 

 The grapevine flea-beetle is most injurious to the buds of the 

 vines in the spring. Vines that are regularly sprayed with poisons 

 are usually not troubled with flea-beetles. They are however 



Fia. 174. — Grapevines pruned with single horizontal cordons, with spurs and half-long 

 canes to start new wood. (California Station.) 



more difficult to poison than most insects and eight pounds of 

 arsenate of lead to forty gallons of water is advised. 



Rose-chafers are often serious enemies of grapes, eating the 

 surface from the leaves. When very abundant, the only successful 

 method of control is to jar them off on stretchers of cloth from 

 which they are collected and killed in kerosene. The stretcher 

 may be somewhat funnel shaped and lead to the dish of kerosene 

 below. 



