VEGETABLE AND FIELD CEOPS 



203 



the leaves, and from them the pods, soon become in- 

 fected with watery, ulcer-Ulce spots without definite bound- 

 ary, similar to 

 those upon the 

 leaves, though 

 often amber 

 coated. Attack 

 upon young pods 

 kills them. 



This disease is 

 carried over the 

 season largely by 

 infected seed and 

 is conveyed from 

 plant to plant in 

 the field by in- 

 sects. 



Diseased seed 

 and seed from 

 fields bearing the 

 disease should 

 be avoided, and 

 clean culture, in- 

 cluding the burn- 

 ing of all infected 

 plant parts, 

 should be prac- 

 ticed. The fol- 

 lowing list shows 



the variation in resistance, the least susceptible being 

 placed first and the most susceptible last : Schindler's 



Fig. 91. — Bacteriosis of the bean. After Halstead. 



