292 



Bulletin 255. 



from the examinations that the writer has made of this seed, he is 

 inclined to believe that the seed planted this year will be relatively 

 free from the disease, though not sufificiently so to prevent serious loss, 

 should weather conditions be particularly favorable. The practice of 



purchasing seed from 

 distant seedmen, or 

 from growers in other 

 parts of this State or 

 other States, will be 

 of little or no value 

 in getting rid of the 

 anthracnose, as we 

 have found the dis- 

 ease to be very gen- 

 erally distributed 

 throughout the east- 

 ern and central United 

 States and is not un- 

 known, by any means 

 in the West. 



Cause of the disease. 

 — As indicated above 

 the disease is caused 

 by the fungus, Col- 

 leototrichum 1 i n d e- 

 muthianum the main 

 features of the life 

 history of which are 

 well known and have 

 been carefully de- 

 tailed in bulletin 239. 

 Fig. 220. — Showing anthracnose spots on stein and leaves Fig. 221 which is re- 

 of bean just before blossoyning time. It is from these • . -, r -u n +• 



spots that spores are distributed to the pods. prmted trom buUetm 



23 9, shows the general 

 structure of the parasite and the relation which it bears to the 

 spotted seed within. It may be well to repeat here, what has already 

 appeared in bulletin 239 on this phase of the subject. "The disease 

 may and usually does occur, however, on all parts of the plant except 

 the roots. (Fig. 220). It is caused by a fungus known to botanists 

 as Colleototrichum lindemuthianuni which lives as a parasite in the tissues 

 of the bean. This fungus is a plant, as much a plant as the bean on 



