308 Keport op the Horticulturist of the 



The Station recommends potassium sulphide, 1 oz. to 3 gals, 

 or 1 oz. to 2 gals, of water, as the most effective fungicide for 

 gooseberry mildew. 



As a rule only the English varieties and their seedlings are 

 attacked by mildew although the American varieties are not 

 always exempt. 



INTRODUCTION. 



Potassium sulphide was first used as a remedy for the powdery 

 mildews in Europe about 1884. In 1886 it was used to a very 

 limited extent in this country. In the following year, 1887, this 

 Station* made the first practioal test of the efficiency of potas- 

 sium sulphide in combating gooseberry mildew, and although the 

 material was not applied until the mildew was well established, 

 the results showed that there was a beneficial effect from its use. 

 Since then its efficiency has been proven by successive testsf and 

 it has been recommended by the Station as the best remedy for 

 holding mildew in check. 



After Bordeaux mixture came into general use some authori- 

 tiesj advocated it as a substitute for potassium sulphide early in 

 the season, but so far as known to the writer, these recommenda- 

 tions were not based on comparative tests of the two fungicides. 

 The only record of such a comparison which he finds is that of 

 an undecisive test made at this Station in 1892. Accordingly, in 

 1897, experiments were planned so as to compare them side by 

 side. For comi)arison with Bordeaux mixture and potassium 

 sulphide two other fungicides, lysol and formalin, were tried. 

 So far as the writer has been able to find out, lysol and formalin 

 have never before been used for this purpose. 



•Arthur. Sulphide of Potassium as a Fungicide. N. Y. Agl. Exp. Sta. Rept. 1887, 

 pp. 348-350. 



tGoff. Potassium Sulphide for Gooseberry Mildew. N. Y. Agl. Exp. Sta. Rept. 1888, 

 pp. 153-154. Hunn. Gooseberries. N. Y. Agl. Exp. Sta. Rept. 1889. p. 334; 1890, p. 307; 

 1891, p. 474. Beach and Paddock. Gooseberry Mildew. N. Y. Agl. E.';p. Sta. Rept. 

 1895, p. 354. 



JLodeman. The Spraying of Plants, p. 292; and Spray Calendars, Cornell Univ. Agl. 

 Exp. sta., Feb., 1895, and Feb., 1896. Taft. Spray Calendar, Mich. Agl. Exp. Sta., 

 Apr., 1894; Green, Selby and Webster. Spray Calendar, Supplemo.nt to Ohio Agl. Exp. 

 Sta., Bui. 79. Spray Calendar, Md. Agl. Exp. Sta., Apr., 1896. Spray Calendar, Del. 

 Agl. Exp. Sta., Apr., 1895. Craig [Canadian] Exptl. Farms Rept. 1895. 



