1004 



Walter H. Burkholder 



for the result of unfavorable weather conditions. Thus, where the disease 

 is not abundant it could easily be overlooked. 



In New York State where the dry root-rot is common, severe losses 

 to the bean crop result. It is a matter of common observation that there 

 has been during the past ten years a marked decrease in the bean yield. 

 The decrease has been estimated by a number of the large growers and 

 seedsmen to be approximately 25 per cent. The writer, from observations 

 in the bean section, is led to the conclusion that no small part of this 

 decrease is due to the dry root-rot. 



SYMPTOMS OF THE DISEASE 

 ON THE ROOTS AND OTHER UNDERGROUND PARTS 



The first signs of the disease on the bean show a week or two after 

 the plant has appeared above ground. At this time there may be observed 



Fig. 133. the dry root-rot of the bean 



At left, root of a White Marrow bean affected with dry root-rot. At right, a healthy root; the strong 

 lateral roots branching off from the lower end of the taproot are evident 



on the taproot a reddish discoloration, but the morphology of the root 

 remains normal. The discoloration may cover the taproot and have no 



