306 Vineyard Culture. 



first whitish, and afterward assuming a brown color. 

 This larva spends the winter in the ground, and gnaws 

 the roots of the vine ; in the spring it devours the 

 shoots and young leaves. 



M. Paul has lately conceived the following plan to 

 destroy this beetle. Grind oil-cakes in an oil-mill ; 

 spread them over the ground in the proportion of 1,080 



[FlG. 129.] Leaf attacked by the Fine -Beetle ana 

 its Larva. 



pounds to the acre, and plow them in immediately. 

 These oil-cakes must not have been heated beyond 

 eighty degrees, and are made as dry as possible, other- 

 wise the essential oil of mustard, which has the prop- 

 erty of destroying the insects, will have disappeared. 

 The operation, repeated every three years, completely 

 destroys the larvae of this beetle, which live in the 

 ground. 



