78 



SOME INSECTS INJURIOUS TO TRUCK CROPS. 



Fletcher," in writing of this species, says that in Canada there are 

 two generations a year, the first appearing in June and the second in 

 August. The generation appearing in August is with little doubt the 

 newly developed first generation, and, reasoning from analogy, i. e., 

 from what we know of related flea-beetles, it is this generation of the 

 beetle that hibernates ; thus the so-called '' first generation " is simply 



that same generation reappear- 

 ing the following spring and 

 early summer 



As to hibernation. Piper " 

 and Doane ^ have recorded that 

 the beetle passes the winter 

 imder stones or rubbish, in 

 which respect it resembles 

 practically all other species of 

 American flea-beetles, and that 

 with the first warm days of 

 spring the beetles emerge from 

 their winter quarters and im- 

 mediately commence feeding 

 voraciously upon their various 

 food plants. 



The following account of 

 the life history and habits of 

 the species in tlie worst affect- 

 ed locality in British Colum- 

 bia has been kindly furnished 

 by Mr. H. J. Quayle, who has 

 also given an account of reme- 

 dial experiments which sup- 

 plement those previously fur- 

 nished by conversation with 

 Mr. Eder; indeed, without the 

 information supplied by these 

 two gentlemen this article 

 would be quite incomplete. 

 Before transcribing Mr. 

 Quayle's account it may be well to draw from it, according to the 

 statement of Mr. H. Hulbert, Sardis, B. C, that this species made 

 its first appearance as a hop pest in British Columbia in 1894 and that 

 it has been of great importance for five years, or since about 1903. In 

 regard to Mr. Hulbert *s statement that the beetles-^disappear about 

 June 1 and reappear the last of July, it is obvious that during that 

 period the larva? are maturing, the pupa? are formed, and the beetles 

 of the first, or new, generation appear. 



66— VI 



Fig. 15.- 



-Work of flea-beetle after vines are 

 grown. (Oi-iginal.) 



