INSECTS, DISEASES, REMEDIES 



59 



most favorable for the lima bean mildew, a thorough 

 treatment of the vines with Bordeaux will insure a 

 crop. The selection of well drained land and a light 

 soil, reducing the number of vines in the hill, and 

 planting the poles erect will insure conditions little 

 favorable to the development of the fungus. 



Bean rust (Uromyces appendiciilatus), an old fun- 

 gous enemy of the bean, was described by Personn as 

 early as 1797. However, it is not usually a serious 

 trouble in this country. Halsted tells us* this dis- 

 ease forms small, brown, circular spots scattered 



FIG. 20 BEAN LADYBIRD, (a), LARVA; (&), BEETLE; 



{c), pupa; {d), EGG MASSES. ALL THREE TIMES 

 NATURAL SIZE. 



over the surface of the leaf, most abundantly upon the 

 under side, while the leaf stalks and even the pods 

 are likewise affected. When upon the pods, the 

 spots are often larger and more elevated than upon 

 the foliage. The color of the spots at first is nearly 

 that of iron rust, from which fact the common name 

 is derived. A large part of the destructive work is 

 done before its presence is recognized and there is 

 but little hope of saving foliage that is already badly 

 rusted. 



*N J Bui 161. 



