CONTKOL OF INSECTS INJURIOUS TO THE GltAPE 1297 



places which cannot be cultivated should ho burned over to de- 

 stroy hibernating places of the grape leaf hopper and other spe- 

 cies. In this connection we will add that berries should never be 

 planted near grapes, owing to the fact that they afford hibernat- 

 ing places for and are the spring food plants of the grape leaf 

 hopper. The destruction of all wild grapevines near vineyards 

 will assist materially in the control of the grapevine flea-beetle. 

 It is true that clean culture as denned above will not assist in the 

 prevention or control of the grape root-worm. 



Spraying 



Every vineyard would be benefited by at least one annual appli- 

 cation of bordeaux mixture (4-450) with 3 pounds of paste ar- 

 seiiate of lead, no matter how few insect pests might be present. 

 This protects the vines from the powdery mildew, and also pre- 

 vents insects from migrating into and thus becoming established in 

 a vineyard. The application should be made about two weeks 

 after the fruit has set. This single spraying has been found ade- 

 quate in many of our experimental yineyards. This application 

 should l>e made the first week in July. 



FIG. 436. INJURY TO ROOTS OF GRAPE BY LARVAE OF GRAPE ROOT-WORM. 

 NOTE ABSENCE OF ALL FIBROUS ROOTLETS 



