INSECTS, DISEASES, REMEDIES 6l 



to the bean leaf spot. The disease has, however, a 

 tendency to checker up the leaf more than leaf spot. 

 Repeated tests have shown that the disease can 

 be readily overcome by thorough spraying. There- 

 fore, any fungicide, such as Bordeaux, that is used 

 for anthracnose may be used with equally good re- 

 sults against leaf blotch. It is fortunate indeed for 

 the farmer that practically the same spraying with 

 Bordeaux will check the advance of any or all of the 

 fungous diseases, known as enemies of the bean 

 plant. 



Other diseases of beans are of little commercial 

 importance in the United States. The bean canker 

 is a disease of French and scarlet runner beans. In 

 1901, many reports were received by the New York 

 experiment station relative to a disease of the bean 

 plant. The stems of nearly grown plants were 

 broken over at the joints and an examination re- 

 vealed the appearance of rotting at the joints. The 

 trouble came to be known as the joint rot of the 

 bean stem. Professor Stone* tells us that the real 

 character of the trouble and its cause were not dis- 

 covered though it was supposed to be due to exces- 

 sive rains. Inquiry the following season in the bean 

 fields did not reveal its presence in spite of the fact 

 that the season was characterized by greater abundance 

 of rain than the preceding one. 



INSECT PESTS 



Bean weevil (Bruchus obtectus) is a formidable 

 enemy of beans. It not only oviposits and develops 

 in the pods in the field, but continues to breed for 

 successive generations in harvested and stored seed, 



"N Y Cornell Bui 210. 



