344 Report of the Horticulturist of the 



June 24th the fifth treatment was made. It was again noted that 

 the disease was spreading but little on the unsprayed plants, and 

 scarcely any could be found on the treated canes. As soon as the 

 fruiting saason was over the old canes were removed from all the 

 rows and the sixth spraying was given August 15th. 



Observations made on November 19th show that the canes in the 

 sprayed rows were nearly free from disease, and since the removal 

 of the old canes in August but comparatively little disease is to be 

 found in the untreated rows. The extremely dry weather of the 

 past season was unfavorable to the spread of most plant diseases. 

 It has been Mr. Hosmer's previous experience that the third year 

 the crop would be much lessened, and the fourth year it would be 

 almost an entire failure. Unfortunately for experimental purposes 

 the past two seasons have been exceptions in this respect, and the 

 gains resulting from the treatment are not as marked as could be 

 desired. Although the fruiting canes in the sprayed rows had the 

 advantage during the season of 1895 in being almost free from 

 disease, yet the gain from the increased yield of the treated over the 

 untreated rows was slight. 



The results obtained in 1894, clearly indicate that the anthracnose 

 of black raspberries can be successfully combated with Bordeaux 

 mixture. The least number of treatments necessary to do this have 

 not been determined. In 1895, the rows that were sprayed with 

 iron sulphate before the leaves expanded bore a larger amount of 

 fruit than any of the other rows. Further experimenting however 

 will be necessary to determine the value of the early treatment with 

 strong solutions. It is certain that the sulphuric acid treatment is 

 too heroic to be used on raspberries. 



As was stated above, tlie exact number of sprayings necessary to 

 prevent the spread of anthracnose has not been determined, nor can 

 it well be since no two seasons are alike, but from observations made 

 during the past two seasons we feel warranted in making the follow- 

 ing recommendations : Give the new canes three sprayings with 

 Bordeaux mixture beginning when the largest of them are about six 

 inches tall. Let the other applications follow at intervals of about 

 two weeks. The spray should be directed at the young canes alone, 

 since they are the only parts of the plants that need protection. The 

 work must be thoroughly done and care must be taken that the 

 Bordeaux mixture is properly made. When the disease is severe the 

 old canes should be cut out and removed from the field as soon as 



