110 



MORTIER P. BARRUS 



FlG. 11. ANTHRACNOSE ON BEAN LEAVES 



Lesions on the veins cause death of the mesophyll about them, and show as brown dead spots or 

 irregular areas on the upper surface of the leaves 



The other parts of older plants may become diseased, and lesions 

 similar to those already described may appear on the branches of the 

 plant and on the pedicels, the sepals, and the bracts of the inflorescence. 

 These parts of plants grown out-of-doors, however, become affected only 

 during protracted periods of weather favorable for the organism. 



On the pods 

 It is on the pods that the disease assumes its most striking appearance 

 (Plate V). The first evidence of it there is the occurrence of tiny brown 

 specks in the epidermis. These may be rufous or ferruginous, slightly 

 elongated areas extending at an angle to the long axis of the pod. 

 These specks enlarge to spots which become black at the center, with 

 a vinaceous-rufous to hazel-colored border of varying width. These 



