12 



DISEASES OF CROPS 



The Humble Bees (Bombus hccorum, Bombus 

 terrestris), wliose nests are generally constructed of moss, 

 containing a few waxen cells, at times injure bean crops 

 by piercing the calyx of the flower, so as to extract the 

 nectar inside. This often causes the fall of the flower or 

 seedless pod. 



Prevention. — The only means is to destroy their nests. 



Fig. 2. — Bean Beetle {Bruehus granarim). 



A. The boetle (enlarged). 



B. Its natural size. 



0. Larva (natural size). 

 D. Pupa (natural sizej. 

 B. Injured bean. 



The Bean Beetle {Bruehus granarius) is a mem- 

 ber of a vast group of beetles, which embraces several 

 thousand species. The group is popularly known under 

 the name of weevils. "Many of these creatures are 

 extremely injurious to vegetables, both while growing 

 and when stored up in barns and granaries." 



The Bean Beetle (Kg. 2 A) attacks bean, pea, and 



