. orchard spraying experiments. 4i 



Previous Experiments with Lime-Suephur as Summer 



Sprays. 



Two forms of lime-sulphur sprays have been employed as 

 fungicides since 1907 — the self-cooked or so-called "self-boiled" 

 preparation devised and first used by Mr. W. M. Scott of the 

 Bureau of Plant Industry, U. S. D. A., and the boiled solution 

 first tried as a summer spray by Prof. A. B. Cordley of the 

 Oregon Experiment Station.* The results obtained have 

 proved an incentive to further work along these lines by the 

 Federal Department of Agriculture and station workers in sev- 

 eral states where the fruit growing industry is of considerable 

 importance. 



Scott's work in 1907** carried on in Arkansas and Missouri, 

 v-as a comparison of his self-boiled with the cooked lime-sul- 

 phur and with bordeaux in the control of bitter rot ( Glomcrella 

 rufomaculans (Berk.) Spauld. and von Schrenk), apple blotch 

 (PliyUosticta solitaria, E. & E.), peach brown rot (Sclerotinia 

 fntctigcna (Pers.) Schroet.) and peach scab (Cladosporium 

 carpophilum, Thtim). The self-boiled mixture was of the 15- 

 10-50 formula. f Both cold and hot water were used in the 

 making. The 5-3-50 formula was boiled for 45 minutes. 

 Weather conditions were favorable for spraying, and 3 appli- 

 cations were made. 



Results: Bitter rot, a serious trouble in southern apple 

 regions, was successfully controlled by self-boiled lime-sulphur, 

 as indicated in the following- table. 



* Note. — The commercial lime-sulphur preparations do not differ in 

 nature to any extent from the properly prepared home-boiled concen- 

 trated solution. 



**Scott, W. M. loc. cit. 



fNoTE. — In referring to the composition of lime-sulphur solutions in 

 this bulletin, the first amount represents pounds of lime, the second 

 pounds of sulphur, and the last gallons of water. For the dilutions of 

 concentrates the first figure represents concentrate in gallons, the sec- 

 ond water. For bordeaux mixture, copper sulphate in pounds is given 

 first, lime in pounds next, and water in gallons last. 



