-288 JJULLETIN 255. 



it is proposed to conduct during the next few years careful experiments 

 to determine if an effective machine may not 3"et be found for this pur- 

 pose. However, the observations of the past two seasons have brought 

 to Hght certain conditions, which would still have to be overcome, 

 even if an effective arrangement of nozzles were worked out. In the 

 first place, many beans are grown on extremely stony soil. The difficulty 

 of keeping the nozzles in proper position on such soils is best apparent 

 to those who have tried the operation. Another difficulty is that of 

 applying the mixture at the proper time. This is particularly true 

 during seasons of hea\^ rain. The growing parts of the plant must con- 

 stantly be kept covered with the mixture. If the soil is soft from heavy 

 rains, it may be impossible to get on the fields with heavy machinery 

 in time to make the application effective. But even if these conditions 

 were finally surmounted, spraying would still remain very expensive 

 on account of the machiner}^, chemicals, and labor required, and last 

 and not unimportant, spraying of any kind is an exceedingly unpleasant 

 business, and can he effectively done only by competent persons. For this 

 reason, if anothermethod of controlling the disease can be found, it should 

 certainly be tested out and presented to the grower. 



Cultivating or working beans when wet should be avoided as much as 

 possible. On this point there can be no dispute. The character of the 

 parasite causing the disease, and the practical experience of growers 

 everywhere show that this recommendation is correct. 



Susceptibility of varieties. — The writer has nothing to add to the 

 discussion on this point. 



NATURE OF THE DISEASE. 



The Bean Anthracnose is known to growers under a number of dif- 

 ferent names, depending largely upon the locality. Perhaps the most 

 common one applied to this malady is "rust." However, as a matter 

 of fact the disease is not rust at all, though the spots do have a reddish 

 yellow color in their early stages. There is a true rust of beans which 

 is rarely met w4th in ordinar}^ bean fields. Pod-spot is a name which 

 is frequently applied to the disease, as it appears in the pods. Blight 

 is also commonly used, but incorrectly so, as we have a true bacterial 

 blight of beans, which is not only very common, but frequently quite 

 destructive. The general characters of these three commonest diseases 

 of beans are set forth in bulletin 239, and accompanied with figures, 

 which show clearly their respective characters. This bulletin is still 

 in print and will be sent upon application. Whatever name may be 



