The Grape-vine Flea-beetle. 



207 



and their work, after reading our discussion of when, where and 

 how they work and how they look. Their work is quite conspic- 

 uous (figure 19) and as they usually feed exposed on the upper 

 side of the grape 

 leaves, it is an easy 

 matter to locate 

 them and to hit 

 them on their 

 feeding ground 

 with a spray. Ex- 

 periments have 

 shown that the 

 grubs readily suc- 

 cumb to a spray of 

 whale-oil soap (i 

 pound in 6 or 8 

 gallons of water) 

 or kerosene emul- 

 sion ; but as these 

 insecticides kill by 

 contact, it is nec- 

 essar}^ to hit the 

 grubs themselves 

 with the spray. A 

 less expensive and 

 easier method is to 

 spray the infested 

 foliage with Paris 

 green or some 

 other poison, 

 thus poisoning 

 their food. For this purpose the poison need not be used as 

 strong as on the buds to kill the beetles ; a pound of Paris green 

 in 150 gallons of water is strong enough to kill the grubs 

 quickly. 



We would strongly advise all grape -growers who have this pest 

 to fight to devote considerable of their energy toward killing the 

 little brown grubs of this flea-beetle when they feed on the leaves 



19. — Grape foliage riddled by the grubs of the Grape- 

 vine Flea-beetle ; reduced in size. 



