396 FRUIT INSECTS 



of the loss occasioned by white grubs can be avoided by adopting 

 the one-crop system of strawberry culture and alternating with 

 some crop more or less immune, such as beans or peas. In the 

 South sweet potatoes are often raised as an alternate crop. 

 Experiments in Illinois have shown that hogs are of great value 

 in cleaning up badly infested fields in the fall. 



When newly set plants show by their lack of vigor that grubs 

 have attacked the roots there is nothing to do but to dig out 

 and kill the culprit by hand. This will pay in small beds, but is 

 too expensive and laborious to be practicable in large fields. 



References 



Forbes, 18th Kept. State Ent. 111., pp. 109-144. 1894. 

 lU. Agr. Exp. Sta. Bull. 116. 1907. 



Other Strawberry Insects 



Oblique-banded leaf-roller : apple, p. 65. 

 Flea-beetles : apple, p. 203. 

 Raspberry leaf-roller: raspberry, p. 321. 

 Negro bug : raspberry, p. 324. 

 Rose chafer : grape, p. 397. 



