REPORT OF THE HORTICULTURIST. 



S. A. BEACH. 



L IKEATMENT OF LEAF SPOT IN PLUM AND 

 CHEERY ORCHARDS IN 189(;.* 



SUMMARY. 



The following report of the work in treating the leaf spot 

 disease of plum and cherry in 1896 is intended as a sequel to 

 Bulletin 98 which contains an account of the work in 1895. 



Work with Plums. 



The questions investigated in 1896 w^ere: 



(1) Can the disease be controlled with tw^o treatments of 

 Bordeaux mixture 1 to 11? 



(2) If but two or three treatments are to be made when should 

 they be given? 



In the case of Italian Prune, on w^hich variety the disease was 

 most prevalent, the best results came from three treatments made 

 May 25, June 17 and July 11. 



The experiments indicate that if but tw^o or three treatments 

 are made the first should be given during the last w^eek of May, or 

 about ten davs after the blossoms fall, and the second about 

 three weeks later. 



In seasons when the disease is no worse than it was in 1896 

 it may be practically controlled by two sprayings. 



These experiments show an average increase in the yield of 

 sprayed Italian Prunes of 24| lbs. per tree at a cost of less than 

 one cent per pound. 



Work with Cherries. 



On orchard trees of Montmorency sprayed with Bordeaux mix- 

 ture May 11, May 29 and June 15, 1895, only a slight amount of 



* Reprint of BuUetin No, 117. 



