39G Report of the Horticulturist ok the 



Experiments op 1896. 



Objects. — The experiments in 1890 were a continuation in part 

 of the worii of 1805; the objects were to learn: 



(1) What is the fewest number of treatments necessary for 

 controlling plum leaf-spot; 



(2) When is the best time for making the treatment. 



The comparison of Bordeaux mixture with eau celeste soap 

 mixture was not continued in 1806 because the work of 1805 

 clearly showed the inferiority of the eau celeste, at least for 

 treatments that are given before mid-summer. Neither in 1805 

 nor in 1896 did the leaf -spot do enough injury before the last 

 of August to permit of a satisfactory test of August treatment. 



Through the kindness of T. C. Maxwell & Bros., a block of 

 trees adjacent to those which were used in the experiments of 

 1895 was used for these experiments. The block contained 168 

 trees, 72 Italian Prune, 48 Guii and 48 Lombard. 



Plan of Experiments. — Four series of treatments were given 

 in 1896. 



Series 1. Sprayed Italian Prune, Guii and Lombard May 14, 

 June 3 and June 17. 



Series 2. Sprayed Italian I'rune, Guii and Lombard May 25 

 and June 24. 



Series 3. Sprayed Italian Prune and Lombard May 25, June 

 17 and July 14. 



Series 4. Sprayed Guii May 25 and June 17. 

 In all cases Bordeaux mixture was used. It was made accord- 

 ing to the 1 to 11 formula, as described on p. 303. The accom- 

 panying plan shows the relative position of sprayed and un- 

 sprayed trees of the different series. The numbers of the rows 

 correspond to those of the block of trees which was used in the 

 1805 experiments, see page 392. 



In the accompanying plan the letter " o " indicates the location 

 of untreated trees and the letter " s " indicates the location of 

 the sprayed trees. 



