394 Report of the Horticulturist of the 



the comparative merits of the different treatments. Plate XXV, 

 reproduced from a photograph made September 28, 1895, shows 

 in the foreground an unsprayed Guii tree, still holding a consid- 

 erable amount of its foliage. Immediately behind it, in the 

 same row, are seen some unsprayed Italian Prune trees which 

 are nearly leafless. This picture illustrates well the general 

 difference between unsprayed trees of these two varieties on 

 that date. The leafless condition of unsjjrayed Italian Prunes 

 is still better shown in plate XXVI, which is also reproduced 

 from a photograph taken September 28, 1895. These trees had 

 gradually lost their foliage from the attacks of the leaf-spot 

 disease. A very careful estimate of the injury or loss of foliage 

 from all causes, which was made September 28, gave the follow- 

 ing results: 



Seriesl. Treated ( Hordcjinx mixture 24 per cent, injury or loss 



» May 1, May 17 < Eau celeste soap mixture 66 per cent, injury or loss 



:iud June 1 ( No treatment 95))erc(Mit. itijnry or loss 



StMies2. Treated ( Bordeaux mixture 10 per cent, injuiy or loss 



May 17, June 1 < Eau celeste soap mixture 73 per cent, injury or loss 



and June 15. ( No treatment 78 per cent, injury or loss 



It appears from this table that much better results were se- 

 cured with the Bordeaux mixture than with the eau celeste soap 

 mixture. This is well illustrated by comparing plate XXVII 

 with plates XXVI and XXVIII. Plate XXVII is from a photo- 

 graph of Italian Prunes which were included in Series 2, and 

 sprayed with Bordeaux mixture May 17, June 1 and June 15. 

 Plate XXVIII is from a photograph of corresponding Italian 

 Prunes which were sprayed on the same dates with the eau 

 celeste soap mixture. Plate XXVI is from a photograph of cor- 

 responding Italian Prune trees which were not sprayed at all. 

 All photographs were taken September 28, 1895. 



Best Time for Treatment. 



As before stated, one of the objects of the investigations in 

 1895 was to discover the fewest number of treatments that will 

 be necessary for controlling the disease and the best time for 



