386 Report op the Horticulturist op the 



tinued, but the comparison of the Bordeaux mixture with the 

 eau celeste soap mixture was dropped, for the results obtained 

 in 1895 showed clearly that the eau celeste is inferior at least 

 for treatments that are given before mid-summer. Neither in 

 1895 nor in 1896 did the leaf-spot show enough injury before 

 the last of August to permit of a comparison of the Bordeaux 

 mixture with the eau celeste for August treatment. 



The courses of treatment with Bordeaux mixture before mid- 

 summer which were tried in 1896 resulted in marked benefit, 

 especially to Italian Prune, and to a large extent confirmed the 

 results of the work in 1895. 



Strength op Bordeaux Mixture Used. 



In these experiments a comparatively weak Bordeaux mixture 

 was used, namely, the 1 to 11 formula, for it had previously been 

 shown that the plum leaf-spot may be controlled by using the 

 mixture at this strength.* This formula again proved satis- 

 factory, and it is confidently recommended for use in treating 

 the leaf-spot. In view of these investigations the following line 

 of treatment is advocated for bearing orchards: 



Course op Treatment Recommended for Plum Leap-spot. 



Apply Bordeaux mixture, 1 to 11 formula, as follows: 



1. About May 25 or within ten days after the blossoms have 

 fallen. 



2. About June 15 or three weeks after the first treatment. 



3. About four weeks after the second treatment. 



Spraying before the blossoms open to prevent leaf-spot has not 

 proved superior to the course of treatment above given. 



If only two treatments can be given let them be made about 

 May 25 and June 17, but better results will usually follow the 

 three treatments above recommended. 



We have not yet seen the leaf-spot become serious in August 

 after a course of treatment like that just recommended. Should 



*Green, W..T. RuU. Oliio Bxp. Sta, 1891: •JIf.. Be>arli. S. A. Kep. N. T. State Bxp. Sta. 

 1893: 688-693. 



