INJURIOUS TO CUCUMBER, SQUASH AND MELON 113 



mixture and that it does not elieek the growth of tlie phmts if 

 appUed while they are small as does the latter. Tol)aeeo dust, 

 air-slaked lime and land plaster are of value as deterrents and 

 will be found useful in the home garden. 



Much loss from beetle attack may be prevented by thorough 

 cultivation and the use of the proper fertilizers to stimulate 

 rapid growth. At the end of the season, all rubbish, including 

 the old vines, should be collected and burned in order to reduce 

 to a minimum the shelter for the hibernating beetles. 



References 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 158. 1899. 



Ky. Agr. Exp. Sta. Bull. 91, pp. 1-15. 1901. 



U. S. Bur. Eiit. Circ. 31. 1898 and 1909. 



N. H. Agr. Exp. Sta. 19tli and 20th Kept., pp. 499-513. 1908. 



Western Cucumber Beetle 



Diahrotica trivittata Mannerheim 



On the Pacific Coast the striped cucumber beetle is replaced 

 by a closely related form. This species may be distinguished 

 from its eastern relative by its darker color and by having the 

 antennse and the greater part of the legs black. The habits 

 and life history of the western form are very similar to those 

 of the eastern species but it has not, on the whole proved as 

 injurious. There are said to be two generations annually. 

 When attacking cucurbits, it may be controlled by the same 

 means as suggested for that species. 



The Twelve-Spotted Cucumber Beetle 



Diahrotica duodecempunctata Olivier 



This beetle is also known as the southern corn root-worm 

 and is discussed on page 222 as a corn pest. When attacking 



