244 



BREEDING CHOP PLANTS 



data on the inheritance of economic characters in the garden 

 bean. Table LXII is made up from his summary. 



TABLE LXII. INHERITANCE IN THE BEAN 



The inheritance of resistance to various diseases is extremely 

 important. One of the most injurious diseases of the bean is 

 anthracnose (Colletotrichum lindemuthi anum) . Barrus (1918), 

 as the result of an extensive study, was able to place beans in four 

 groups with respect to susceptibility or resistance to this disease. 

 Over two hundred varieties of beans commonly grown, besides 

 many others, were tested. A considerable number of plants 

 belonging to closely related genera were also examined. The 

 cultures of anthracnose used for inoculating the varieties were 

 obtained from widely separated geographical areas. By study- 

 ing the reaction of the various cultures to each bean variety, two 

 strains of anthracnose, alpha and beta, were discovered. With 

 respect to their reaction to these two anthracnose strains, varie- 

 ties of beans were placed in four groups: 



(ab) Varieties susceptible to both strain alpha and strain beta. 

 (aB) Varieties susceptible to strain alpha but resistant to strain beta. 

 (Ab) Varieties susceptible to strain beta but resistant to strain alpha. 

 (AB) Varieties showing some resistance to both strains. 



The most resistant variety of the last group is Wells Red 

 Kidney. Results of crosses between varieties whose anthracnose 



