INSECTS INJURIOUS TO THE GRAPE 



505 



Life History. The adult beetles appear about the close of the 

 blooming period, or in late June and early July in the latitude 

 of New York, and live for a month or more. They emerge earlier 

 on warm, light sandy soils, and later on heavier soils. In a few 

 days their feeding commences to be noticed on the leaves and the 

 females may be found laying their eggs. A female will lay from 

 150 to 900 eggs, averaging about 175, most of which are laid 



FIG. 363. Portions of three grape roots denuded of their bark and fibrous 

 roots by grape root-worms, and part of a similar root taken from a thrifty 

 vine showing its normal bark and rootlets. Reduced in size. (After 

 Slingerland.) 



during the first two or three weeks. The eggs are laid in masses 

 of 25 to 40 beneath the old bark or generally over the canes. 

 The individual egg is one-twenty-fifth inch long, at first whitish, 

 but soon turns yellow, arid tapers at each end. The eggs hatch 

 in from nine to twelve days, when the young larvae drop to the 

 ground and seek the roots. The young larvae are only one- 

 seventeenth inch long, so that they are able to penetrate the soil. 



