1300 



THE FRUIT INDUSTRY IN XEW YORK STATE 



root-worm this ridge should be allowed to remain until the ma- 

 jority of the larvae have pupated and then be removed with a 

 horse-hoe. This operation crushes many of the pupae and also 

 breaks open* the cells of others, thus exposing them to the air and 

 sunlight. While this operation is very helpful in the control of 

 this species, it should not be relied upon entirely, for many of the 

 pupae w T ill be missed by the horse-hoe. 



FIG. 440. RESULT OF FEEDING BY ADULTS OF GRAPEVINE FLEA-BEETLE, 

 PHOTO TAKEN JUNE 4. AT THIS TIME THE UNINJURED BUDS HAD PRODUCED 

 SHOOTS ABOUT Two FEET IN LENGTH 



The most practical method of controlling the adults is spray- 

 ing with poison sprays. The material to be used is determined 

 by the amount of infestation. With a moderate number of beetles, 

 excellent results are secured by spraying the vines with bordeaux 

 mixture (4450) and three pounds of arsenate of lead as soon 

 as the first adults appear, followed by a second application in 

 about ten days. 



With a serious infestation the best results are secured by spray- 

 ing the vines when the beetles are present in large numbers, using 



