Some Diseases of Beans. 



285 



plants just up (Fig. 103). On the leaves of older plants they blacken 

 and kill the veins on the under side (Fig. loi). Diseased seeds show 

 reddish brown or black spots and are often shrunken or shriveled (Fig. 

 104). This disease is the Anthracnosc (See page 286). 



2. Leaves at first with large watery brown patches which shortly 

 become dry and brittle (Fig. 109). The diseased leaves curl more or 

 less and look as though they had been scorched. Affected pods show 



Fig. 102. — Anthracnosed bean plants. The disease lias 

 eaten off the leaf stalks. From New Jersey Bull. Xo. 

 151- 



"watery" spots (Figs, no and in) which do not become black as in the 

 case of anthracnose. Entire pod may become soft and rotten. This 

 disease is the Blight (See page 295). 



3. Leaves usually remaining green or in severe cases becoming of a 

 sickly yellowish color. Spots on the under side of the leaf very small, 

 rusty brown or black. Sometimes showing on the upper surface of the 

 leaf as black spots with yellow borders (Fig. 113) ; seldom occurring on 

 the stems or pods. This is the true Rust (See page 239). 



