Bean Anthracnose 



139 



growth seems to be of a saprophytic nature, as the pods were dry when 

 picked and at that time none of this growth was observed. Other isolations 

 of C. lindernuthianum have been made from dry bean pods from time to 

 time, even from pods more than a year old. 



Trials were made also to determine whether old pods and vines affected 

 by anthracnose may serve as a source of inoculum to seedlings. In the 

 fall of 1911 a plot of ground where anthracnose had appeared to a severe 

 extent on beans was selected for experiment. The diseased vines were 

 left there, and diseased vines from other places were spread on the plot, 

 all being plowed under the following spring. On June 13 a short row of 

 each of five varieties was planted with seed from selected healthy pods. 

 Adjoining these, one row of each of two varieties was planted with seed 

 spotted with anthracnose. The seedlings were appearing on June 19. 

 In several examinations made before June 25, the plants from the healthy 

 seed showed no affection with" anthracnose, while the young leaves of 

 the plants from spotted seed were severely affected. Eight plants from 

 healthy seed were found to be affected on July 1 as shown in table 5. 

 This may have been due to secondary infection. The order in which the 

 varieties appear in the table is the order in which they were planted in 

 the plot. 



TABLE 5. Results of an Experiment to Determine Whether Old Pods and Vines 

 Affected with Anthracnose Can Serve as a Source of Inoculum to Seedlings 



(Seed planted on June 13, 1912; data taken on July 1, 1912) 



While observations were made each year as to the possibility of infection 

 of seedlings from overwintered vines, no further definite efforts were made 

 to determine this point until the fall of 1915, when a series of experiments 



