196 



INSECTS AFFECTING THE CABBAGE. 



larva', which develop early in autumn, pupating be- 

 fore winter, and hibernating within their cocoons. 

 Remedies. — When young the larva? are congre- 

 gated together upon one or a few leaves, and may 

 then easily be checked by hand-picking. Later they 

 are open to destruction by the application of hot 

 water, insect powder, or kerosene emulsion. 



The Wavy- striped Flea-beetle. 



Phyllotreta vittata. 

 This little pest does not by any means confine its 

 depredations to the cabbage, but attacks turnip, mus- 

 tard, radish, and various other plants as well. It is 

 represented magnified at Fig. 104, b, and is a small, 

 shining black beetle, one tenth of an inch long, with 

 a broad, yellow, wavy, longitudinal stripe on each 

 wing-cover. It feeds upon the surface of the leaf, 

 gnawing out little pits. 

 The females deposit their 

 minute, oval, whitish eggs 

 upon the roots of various 

 cruciferous plants, such as 

 radish, cabbage, turnip, -i 

 etc., and the larva' which 1 

 hatch from them feed up- 

 on these roots, sometimes 



, . . , . Fig. 104. Wavy-striped Flea-beetle : 



doing seriOUS damage 111 a, larva; 6, beetle. 



this way. The full-grown larva (Fig. 104, a) is about 

 one-fourth of an inch long, with a yellowish-white 

 body, and brown head. There appear to be two or 

 more broods each season. 



