BULLETIN 192. 



INSECTS INJURIOUS TO THE VINE. 



119 



be used and the ratio of at least one pound to one hundred gallons of 

 water is required. This spraying should be done as soon as the first 

 beetles make their appearance in the spring. 



Since the pupae are within four to eight inches of the surface much 

 good can be done by thoroughly stirring the ground within a radius of 

 two or three feet about the vine for a depth of six inches or more. If 

 this can be done at the proper time when they are in the pupal stage 

 it will no doubt destroy many. 



It has been suggested and some experiments seem to prove that if 

 the land is left uncultivated about the base of the vine, the beetles will 

 be unable to break through the crust at the surface. We have not had 

 opportunity to demonstrate this point. If successful it must depend 

 largely upon a type of soil that will form a hard, impenetrable layer at 

 the surface. 



HAWK MOTH LARVAE. 



These larvae are occasionally met with over large areas every year in 

 California, and in certain restricted areas they sometimes become 

 exceedingly abundant and may completely defoliate a vineyard. The 

 worst case that has come to our notice this ye^ir was on a vineyard 

 belonging to the California Wine Association near Reedley. 



FIG. 8. Showing one vine in a 75-acre vineyard defoliated by Hawk Moth larvae. 



