110 



PROTECTION OF PLANTS, 1815-16 



(a) fall plowing of sod land twice; (b) a special rotation of crops, bearing 

 in mind the fact that clover, barley, wheat and rye are not so liable to 

 attack as corn, potatoes, mangels and oats. 



All attempts to poison wireworms in the soil have been futile; more- 

 over, no farm crop is immune from their attacks, although many farmers 

 claim that buckwheat, mustard and rape are not attacked. 



Drasterius elegans; a, adult beetle; 6, wirewonn or larva; c, last segment of larva. 



White-Grubs. 



These are the grubs of June beetles which are common in May and 

 June about lights at night. Their large size, white body, brown head, en- 

 larged hinder portion of abdomen and the curled-up attitude of the body 

 distinguish them from other grubs that occur in the soil. They feed on the 

 roots of all kinds of grasses, cereal crops, corn, potatoes and root crops gener- 

 ally. They also injure strawberries, fruit trees and shade trees. 



