THE INSECT WORLD. 



213 



change of location for the strawberry beds. The insects are 

 rarely troublesome in the Eastern, but often injurious in the 

 Central States. Old beds should be ploughed out and destroyed 

 as soon as they have been picked, and when new beds are set out 

 care should be used in selecting plants free from insect attack. 

 Where a two-year picking rotation is used and the old plants are 

 immediately destroyed, the species are not able to increase ex- 

 cessively. The arsenites may be satisfactorily used to kill th-: 



Fig. 205. 



Grape-root-worm, Fidia viticida.—A, adult ; B, pupa ; C, larva ; the other letters refer 

 to details of larval structure. 



adults when they are noticed feeding upon the foliage. Using 

 commercial fertilizers instead of barn-yard manure is also to be 

 recommended. 



Perhaps the best-known species of this family is the " potato- 

 bug," or "potato-beetle," or " lo-lined beetle," or "Colorado 

 potato-beetle," Doryphora lo-lineata. No description of this 

 insect is necessary, the figures serving to illustrate all its stages 

 sufficiently well. The insects winter underground as adults or 

 pupae, and the beetles emerge early in spring, attacking the 

 young plants as soon as they show above ground, and laying- 

 eggs for the livid-reddish larvae. About midsummer these have 

 matured a second brood of beetles, and a second brood of larvae 



