ORCHARD SPRAYING EXPERIMEJNTS. 



47 



At the Delaware station Prof. C. A. McCue* in 1908 sprayed 

 several varieties of peaches with commercial and both home- 

 made sulphur sprays, sulphur water and benzoate bordeaux. 

 He did not consider his results the basis for definite conclusions, 

 and merely pointed out the promising possibilities of the lime- 

 sulphur sprays as fungicides for the peach. Benzoate bordeaux 

 and sulphur water he declares unsafe, as well as undiluted lime- 

 sulphur, irrespective of its time of boiling. Although control- 

 ling brown rot with the self-boiled spray, he could not obtain 

 peaches free from a heavy coating of lime. 



The season of 1909 witnessed an extension of experimental 

 work along the lines in question. At the Michigan station Taft 

 and Wilken** compared commercial and home-made concen- 

 trates on apples, pears, cherries and plums. At 1-25 the pro- 

 prietary sprays caused foliage injury and had to be reduced to 

 1-40. Home-made concentrate of 12-15-50 formula reduced 

 to one-fifth of that strength for summer use did practically no 

 damage to foliage. 



At Cornell University, Wallace's work was concerned with 

 the control of peach leaf curlf and apple scab. One form of a 

 commercial lime-sulphur solution was employed. 



On peaches strengths of 1-9, 1-12, 1-15 and 1-20 were used. 

 The per cent effectiveness was arrived at by choosing limbs 

 with the eyes closed and counting the leaves thereon. Results 

 are given in the following tables. $ 



Table 7. 



JACKSONVILLE ORoHARD, EAST SIDE, SPRAYED Al'RIL 9, 1909. 



Treatment. 



Number of 

 Trees. 



Number of 

 Limbs Diseased 

 Selected. Leaves. 



Per cent. 



of Diseased 



Leaves. 





4 

 6 



14 



22 



660 



18 



58.9 



Niagara Lime-sulphur 1-9 



0.9 



*McCue, C. A. "Spraying for Brown Rot of the Peach, 1908". Dela- 

 ware Agric. Expt. Sta. Bull. 85, (1909). 



** Taft, L. R. and Wilken, F. A. Mich. Agric. Expt. Sta. Special Btill. 

 48, (1909). 



t Wallace, E. "First Report Niagara Sprayer Co. Fellowship on Peach 

 Leaf Curl and Its Control." Cornell University 1909. See also 

 Bull. 276 (1909) N. Y. (Cornell) Expt. Sta. by E. Wallace and H. H. 

 Whetzel, which gives additional data obtained by practical growers. 



% Adapted from original. 



