192 



MORTIER F. BARRUS 



unsprayed as a check, and one of each was sprayed with bordeaux mixture 

 (5-5-50) on July 3, 12, and 24, and August 3, 14, and 24. Data obtained 

 at harvest, October 4, are given in table 14: 



TABLE 14. Yield of Davis Wax and Refugee Wax Beans, and Number and 

 Percentage of Pods Affected with Anthracnose, From Sprayed and from Un- 

 sprated rows in 1916 



It seems to the writer, in view of the results of these experiments, that 

 anthracnose and possibly blight may be kept in check by thoroughly spray- 

 ing the plants with bordeaux mixture, if the operation is begun soon after 

 the plants have appeared above ground and continued at intervals of 

 about ten days until the pods are reaching marketable size. The nature 

 of the growth of the plants determines to a considerable degree whether 

 they may be sprayed well with a spraying machine. Varieties such as 

 those used in the field experiments at Oneida are so bushy that it is very 

 difficult to spray them thoroughly, while such varieties as Crystal Wax, 

 Currie, Davis, Detroit, Double-Barrel, and others, which have a more 

 erect growth, although compact, are less difficult of such treatment. 



The field experiments at Oneida show conclusively that it does not pay 

 to spray during a dry season. Spraying experiments conducted on a 

 small scale with hand sprayers have shown that it is possible to control 

 the disease to a considerable extent by this method. Whether the disease 

 can be controlled as well with traction or power machines during epiphy- 

 totic years is yet an unsettled question. 



