INSECTS INJURIOUS TO THE HOP-PLANT 



279 



The Hop-vine Snout-moth * 



The larvae of the Hop-vine Snout-moth sometimes become 

 very formidable pests in the hop-field, appearing suddenly in 

 large numbers and rapidly eating the foliage over a large area. 



They are not known to have any other food-plant than the 

 hop and hence are only found where that plant occurs, though 

 specimens have been taken from almost all sections of the United 

 States, southern Canada, and British Columbia. 



FIG. 206. The hop-vine snout-moth (Hypena humuli Harr.): a, egg; b, larva 

 c, segment of same; d, pupa; e, cremaster of same; /, adult a, c, e, 

 greatly enlarged, others slightly enlarged. (After Howard, U. S. Dept. 

 Agr) 



Life History. It seems probable that the moths hibernate 

 over winter, as they emerge in the fall, and lay eggs for the first 

 brood early in the following May. The eggs are of a pale green 

 color, and are deposited upon the under surfaces of the leaves, 

 sometimes several upon a single leaf. The larvae emerging from 

 them become mature late in June and early in July. When 

 full-grown the larva? are slightly less than one inch long, and 

 " of a green color, marked with two longitudinal white lines down 

 the back, a dark-green line in the middle between and an indistinct 

 whitish line on each side of the body. The head is green, spotted 



* Hypena humuli Harr. Family Noctuidce. 



