THE BEAN BLIGHT: TYPE 



283 



siderable size and which usually retain a water-soaked trans- 

 lucent) border. 



In severe cases the leaves shrivel and fall off, and the pods 

 become worthless — spotted or dwarfed. If the weather is damp 

 both leaves and pods may also become moldy. If attacked in 



Fig. 216. — First series of inoculations from the Idaho bean (September 23, 

 1914), showing numerous stomatal leaf-spots due to Bacterium phaseoli. The 

 leaf was yellow except around the spots, where the leaf-green persisted. Time, 

 13 days. Temperature of hothouse, 65^C. to 95°C. Leaflet about one-third 

 grown when sprayed. Nat. size. 



early stages of growth the leaves become curved, twisted and 

 variously distorted by reason of injury to the developing veins 

 (seeNos. IX and XI for similar phenomena). The attacked leaves 

 also exhibit a curious persistence of the leaf green around the 

 spots while it disappears altogether from the rest of the leaf. 



