504 Report op the Mycologist of the 



When cousideriug the expense of spraying the fact should be 

 taken into account that usually two, and sometimes more, appli- 

 cations of Paris green are required (o control the Colorado potato 

 beetles. When Bordeaux mixture is used the Paris green may 

 be applied with the Bordeaux mixture and the only additional 

 expense is the price of the Paris green itself. Paris green applied 

 with Bordeaux mixture is more effective than when applied in 

 any other way because it adheres to the foliage better. 



Internal Browning of Potatoes. 



Early in April, 1895, Mr. C. A. J. McCarthy of Cutchogue, N. 

 Y., sent to the Experiment Station some potatoes affected with a 

 peculiar disease. The tubers were outwardly perfect, but when 

 cut open they showed numerous brown spots scattered irregularly 

 through the white flesh. These spots varied in size and their 

 outlines were very irregular and not definitely marked. As a 

 rule, they were distributed throughout the tuber, but frequently 

 they would be found aggregated at one end, in the center, or 

 nearer one side. Mr. McCarthy, who made a large number of ob- 

 servations, says that such aggregations are more likely to occur 

 at the seed end than in any other part of the tuber. There is no 

 rot connected with the disease. 



The same disease has been reported from Minnesota,* and Mr. 

 A. F. Woods, of Washington, D. C, inform;; me that it has been 

 reported to the U. S. Department of Agriculture from other 

 States, and that it has also been observed in Europe. Prof. Green 

 says that in Ramsey and Hennepin counties, Minnesota, probably 

 one-half of the potatoes brought into market in 1894 were af- 

 fected with the disease. Out of thirty-one varieties of potatoes 

 grown on the University farm at St. Anthony Park, Minn., in 

 1894, twenty-eight showed the disease. In eleven of these 

 varieties fifty per cent, or more of the tubers were affected. 

 On Long Island, Mr. McCarthy's experience was different. In 

 1894, he grew thirteen varieties, but Green Mountain was the 

 only one affected. This variety showed about sixty per cent, of 



♦ Minn. Exp. Sta., Bull. No. 39, p. 213. 



