New York Agricultural Experiment Station. 343 



Tlie plan of the experiment may be briefly outlined as follows : 

 The first treatment was made before the leaf buds opened, so that 

 stronger solutions could be used, without doing injury, than would 

 be possible after the leaves had expanded. Solutions of diiferent 

 materials were used, so that a comparison might be made as to their 

 effectiveness. Accordingly, the first three rows were sprayed with 

 a solution of copper sulphate, three pounds to eleven gallons of 

 water ; tlie next three with a saturated solution of iron sulphate, 

 while the next three rows were left untreated for comparison. This 

 plan was continued throughout the plantation, with the exception 

 of the last two rows, making in all eighteen rows treated with the 

 copper solution, fifteen rows treated with the solution of iron sul- 

 phate, and fifteen untreated or check rows. 



Early in the spring before the leaves started one of the last two 

 rows was sprayed with a ten per cent, solution of sulphuric acid, 

 and the other with a solution made up of ten parts of a saturated 

 sohition of iron sulphate to one part of sulphuric acid. After this 

 time all treated rows were sprayed alike with Bordeaux mixture, 

 using one pound of copper sulphate to make eleven gallons of the 

 mixture. 



In 1894 the j^lantation was sprayed six times on the following 

 dates : April ISth, May 1st, May 16th, May 30th, June 21st and 

 August 9th. 



Notes taken at various times throughout the season show that the 

 treatment was effective. The place was visited on November 22d, 

 when it was found that the canes in the treated rows were nearly free 

 from disease, while those that were not sprayed were still very 

 badly affected. 



The plantation was given the same treatment throughout the 

 season of 1895. The first spraying was given on April 26th, just as 

 the leaf buds began to swell. The second treatment was begun on 

 the 11th of May, but on account of rain it was not completed until 

 the 13th ; at this time the new canes had just begun to grow. On 

 May 24th a third spraying was given ; the largest of the new canes 

 were now twelve to fourteen inches high. At this time it was noticed 

 that the two rows which had been treated with sulphuric acid had 

 been seriously injured by the application. A fourth treatment was 

 given on June 10th. A few of the characteristic spots of anthrac- 

 nose were now noticed for the first time on the new canes in the 

 untreated rows, showing that the disease was spreading very slowly. 



