GENERAL CROP PESTS 



57 



tropical. At present it is more at home in the South where 

 opportunity is afforded for its increase in swamp land, among 

 wild rice and rank grasses, but it is also acclimatized in the 

 southern portions of the North and appears to be gradually 

 working its way still farther northward. 



Injury has been noted as far north as Chicago and westward 

 to Colorado and Montana. 



A feature of this insect's attack, from which it derives its 

 name of fall army worm, is that it seldom does appreciable in- 



Fig. 30— Fall army worm, a. Moth, plain gray 

 form: b, fore-wing of Prodenia-like form; c, larva; 

 d, abdominal segment of larva; e. pupa. d. Twice 

 natural size; others enlarged one-fourth. (Authors 

 illustration, U. S- Dept. Agr.) 



^^ 



Fig. 30x.-a, 

 - Head ot fall 



army worm; b. 



of army worm. 



Both enlarged. 



jury except in the fall. It is not often noticed, therefore, except 

 in the extreme South, earlier than the first of August, while 

 the outbreaks of the common army worm usually occur prior 

 to that time. 



There is no doubt that there are two or three generations 

 produced each year, and each succeeding generation usually 

 becomes more destructive. It attacks practically all vegetables. 



The larvae, in years of ordinary abundance, live like cutworms 



