Tenth Annual Meeting 143 



pare the normal salt myself from copper sulphate and lead 

 acetate. On July 31 a solution of this salt, in the same pro- 

 portion as the verdigris, was applied to a number of Early River 

 trees immediately adjoining the others. No injury whatever 

 resulted from this treatment. 



To sum up the results obtained, the fungicides which pro- 

 duced uniform and pernicious effects upon both the foliage and 

 the fruit, were Bordeaux mixture 5-5-50 and 3-3-50, the soda- 

 bordeaux, the ammoniacal solution of copper carbonate, and the 

 sub-acetate of copper or verdigris. Bordeaux mixture, 2-4.-50, 

 was on the border line, inclining to dangerous. The safe 

 fungicides were Bordeaux. 1-2-50; normal copper acetate (8 

 oz. to 50 gals.), and potassium sulphide (i lb. to 50 gals.). 



Turning now to the relative efficiency of these safe fungicides 

 in preventing the spot and mould of the fruit, it must be con- 

 fessed that the results were far from encouraging, especially 

 considering the fact that the season was distinctly favorable to 

 the production of sound and fair fruit, and that the spraying 

 was more thoroughly done than would generally be feasible 

 in ordinary orchard practice. 



The unsprayed trees gave an average of 37 per cent of per- 

 fect fruit ; six applications of potassium sulphide gave 56 per 

 cent; four applications of the same gave 49 per cent; one late 

 application of verdigris (sub-acetate of copper) gave about 50 

 per cent ; one late application of verdigris and one of normal 

 copper acetate gave 29 per cent ; one late application of normal 

 copper acetate gave 47 per cent. 



The best results were obtained with six applications of 

 potassium sulphide, whereby the yield of perfect fruit was in- 

 creased by 19 per cent over that of the unsprayed trees. It is 

 quite possible that had the normal copper acetate been used 

 throughout the season, its beneficial effects would have been 

 more marked, since even the single late application increased the 

 yield of perfect fruit by 10 per cent. 



In conclusion, I feel justified, by these experiments, in 

 recommending for the spraying of peach orchards, the following 

 practice. Before the buds expand, spray thoroughly with Bor- 

 deaux mixture, 5-5-50. After the petals fall and until the fruit 

 ripens, use potassium sulphide (i lb. to 50 gals.), or this treat- 



