VEGETABLE AND FIELD CROPS 



203 



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

 fected with watery, ulcer-Hke spots mthout 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 b>' 

 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- Fig. 91. — Barteriosisofthe be 



lowing list shows 



the variation in resistance, the least susceptible being 



placed first and the most susceptible last : Schindler's 



