vii BEAN 227 



destroyed, and the crop should not be cultivated while 

 the plants are wet, as such cultivation facilitates the 

 distribution of the spores. Bordeaux mixture can be 

 used to advantage on small areas, and wherever else it 

 is practicable and profitable. After the crop is harvested, 

 the rubbish should be collected and burned. Where 

 the disease is especially severe, rotation of crops will 

 prove advantageous. 



FIG. 80. Beans affected with anthracnose, Colletotrichum lindemuthianum. 

 (Photo by C. W. Edgerton.) 



Bacterial Blight. - - This disease, which is due to 

 Pseudomonas pliaseoli, Smith, is well known in the 

 United States, and has no doubt found its way to the 

 American tropics at least. It attacks leaves, stems, and 

 pods. On the leaves it produces brown spots, which 

 spread and frequently destroy the leaf. In dry weather 

 this diseased tissue is brittle, but in wet weather it has 

 the appearance of being water-soaked. It causes the 

 young pods to shrivel and die, but on the larger pods 

 it produces watery spots, which finally become discoloured 

 but not sunken. 



