GRUBS INJURING THE ROOTS 



225 



July, feeds on the leaves, and lays eggs in clusters under loose bark 



on the canes. The young grub, as soon as hatched, drops to the 



ground, makes its way to the roots, and 



feeds throughout the summer. When full 



grown, it is two fifths of an inch long, 



whitish, with a pale brown head. In the 



fall the larva goes deeper in the soil, and 



winters in an earthen cell. In spring it 



returns to a point two or three inches 



below the surface of the ground, and in 



June makes a pupal cell, in which it 



Fig. 280. — The Grape 

 Root-worm. Larvae. 



Original. 



Fig. 281. — Grape leaf showing characteristic 

 work of the adults of the Grape Root-worm. 

 Original. 



remains for nearly three 

 weeks. The adults emerge 

 from this in July. 



The most effective means 

 of control is a thorough 

 spraying of the vines the 

 last of June, or as soon as 

 beetles are seen, using ar- 

 senate of lead 3 pounds, 

 molasses 1 gallon, and water 

 50 gallons. The molasses 

 is added because it attracts 

 the beetles and makes the 

 spraying more effective. 

 Stirring the soil beneath 

 the \'ines about the middle 

 of June will destroy many 

 pupse in their cells. 



White Grubs (Lachnosterna spp.) 



Strawberr\^ plants often are severely injured by white, thick-bodied 

 grubs which feed on the roots. Entire sections in large strawberry 

 patches may thus be killed out. 



This is the same pest that attacks the roots of corn and other field 



Q 



