GRAPE-VINE LEAF-HOPPERS 



165 



Leaf-hoppers are regarded as among the most destructive of 

 grape-vine pests, sucking sap from the leaves and thus greatly 

 weakening the vines. A party in California has estimated his loss 

 on one thousand acres at ten thousand dollars in one year (Fig. 181). 



Control. Remove all rubbish in the field and rake or lightly 

 cultivate the ground. The nymphs or young, being all on the under 





FIG. 181. A grape-vine leaf-hopper, different stages. (Lugger.) 



side of the leaves and not capable of flight, may be sprayed with 

 whale oil soap solution or the resin spray. Use one pound of soap 

 to fifteen gallons of water in the former case. The resin spray is 

 made by adding one pound of resin to fifteen gallons of hot water 

 and enough lye or potash to completely dissolve the resin. This 

 generally takes one pound of lye to eight pounds of resin. The 



