Bean Anthracnose 



183 



Refugee Green Pod, the pods and the undersides of the leaves, which are 

 the particular points of attack, are so protected by their bushy growth 

 that it is very difficult to apply the mixture thoroughly to these places 

 with the ordinary field sprayer. A Niagara gas sprayer was used and 

 the mixture was delivered at 100 pounds pressure from near the ground 

 to the sides of the plant (fig. 20). Two and sometimes three machines 

 were kept busy during the spraying season. In 1908 the company 

 expended 81000 for bean spraying alone, .and in 1909 the expenditure was 

 $1250. Each application cost about .$1 an acre. Thus the spraying 



Fig. 20. platform and apparatus for preparing bordeaux mixture in large ' 

 quantities, and spraying machine devised especially for spraying beans 



question was of sufficient importance to the officials of the company for 

 them to wish to have its value demonstrated, and this in spite of the fact 

 that they had been spraying for the past seven years. 



A calculation of the yield, and of the amount of anthracnose and blight, 

 for the three center unsprayed check rows and for the three bordeaux- 

 sprayed rows adjoining, was made at each picking of every field. A 

 calculation of the yield of plants sprayed with lime-sulfur was made 

 from only a few fields. 



The amount of anthracnose and of blight during the two years was 

 negligible. The difference in yield between sprayed and unsprayed rows 

 was slight, being one year in favor of the sprayed rows and the following 



