18 



adult beetle emerging in the course of 18 or 19 days, at first blackish 

 in color with gray hairs, but soon becoming the normal brown color. 

 In figure 5 the parent beetle is shown in dorsal view at a, and a side 

 view at c; the larva or grub is shown in dorsal and ventral views at d 

 and e, and the pupa at /'. 



The life cycle from egg to adult, as stated by Brooks for a large 

 series of individuals, requires about 35 days. The new generation 

 of beetles feed upon the foliage imtil fall, when they go into hiber- 

 nation, appearing the following spring, as stated. Mr. Brooks de- 

 termined the egg-laying capacity of 30 beetles, the minimum number 

 deposited by one insect being 63, and the maximum 392, with an 

 average of about 257, the oviposition period extending from June 22 

 to September 10, a period of 81 days. Oviposition is apparently 

 most active during the first one or two weeks of July. The beetles 

 of the hibernating and of the new generation overlap, and the earlier- 



FlG. 5. — Grape curculio ( Craponius insequalis): a, Adult or beetle, from above; 6, head, antenna, and 

 beak of same, from side; c, adult, from side; d, larva, from above; e, same, from below; /, pupa, 

 from below. All much enlarged. 



appearing individuals of the latter may oviposit, but the result- 

 ing larvse will mostly fail to reach maturity. Practically there is 

 but one generation a year in the latitude of West Virginia, while in 

 the South a second generation may occur, though it is considered 

 doubtful. 



Treatment. 



Poisoning. — The beetles feed freely upon the foliage of the grape 

 in the spring for several weeks before egg-laying begins and continue 

 feeding in the fall after ego;-laying ceases along with beetles of the 

 new generation, and it is thus an easy matter to bring about their 

 destruction by arsenical sprays. The treatments advised for the 

 grape berry moth and root-worm, with perhaps an additional treat- 

 ment 2 or 3 weeks later, will practically control the insect. 

 284 



