﻿2 BULLETIN 1371^ U. S. DEPARTMENT OF AGBICULTUEE 



The Idaho station in 1918 {9, p. 9) says, '^ Dry lime-sulphur manu- 

 factured by the * * * company was added to the experiment in 

 1917. It gave very encouraging results, but we are not prepared at 

 this time to make any recommendations regarding this spray." 



On page 15 results with a sodium-sulphur are given as follows: 

 1915, 20 pounds to 100 gallons of water, 64 per cent killed; 1916, 

 25 pounds to 100 gallons of water, 82 per cent killed; 1917, 25 pounds 

 to 100 gallons of water, 93 per cent killed. 



In the summary it is stated that the sodium-sulphur ''gave fairly 

 good results in 1917, but we can not recommend its use over lime- 

 sulphur." 



The Illinois station in 1919 {6, p. 4) records tests made with a 

 sodium-sulphur, a barium-sulphur, and two calcium-sulphurs,. showing 

 the following results: Sodium-sulphur, excellent control; barium- 

 sulphur, fair to good control; calcium-sulphurs, excellent control. 



In Bulletin XIII of the Division of Natural History Survey for 

 November, 1920 {10, pp. 341-342), additional tests are reported for 

 one orchard as f oUows : Sodium-sulphur, good control ; barium-suJphur, 

 good control; calcium-sulphur No. 1, good to excellent control; cal- 

 cium-sulphur No. 2, good control; calcium-sulphur No. 3, poor to fair 

 control. 



For another orchard : Sodium-sulphur, fair to good control ; barium- 

 sulphur, fair to good control; calcium-sulphur No. 1, good control; 

 calcium-sulphur No. 2, good control; calcium-sulphur No. 3, very poor 

 control. 



The general conclusions are: 



The results of two years' work with these materials seem to show that some 

 dry sulphur compounds, if used at sufficient strength, are effective in controlling 

 the San Jose scale. From the results of the past season where * * * (jj.y 

 lime-sulphur was used at a strength of 123-^ pounds to 50 gallons of water, it is 

 apparent that these materials should not be used at a less rate than 15 pounds 

 to 50 gallons of water. 



In 1922 {S2, p. 2) it is stated that " the dUuted spray must con- 

 tain 15 pounds of sulphur in 50 gallons," and in 1924 [2, p. 8) the fol- 

 lowing recommendation is made: Each 50 gallons of dormant 

 spray should contain * * * or 15 ^ to 28 * pounds of dry lime- 

 sulphur * * *. 



In its annual report for the year 1919 (7, p. 4-4) the Kentucky 

 station says: 



Use of dry lime-sulphur in sprays. — Four samples of dry lime-sulphur were 

 submitted by the department of horticulture for analysis. It had been noted 

 that the use of the particular samples did not give the results expected. 



The Missouri station in 1920 {13, p. 7) states: 



Some report good results with dry lime-sulphur used at the rate of about 1 

 pound to 4 gallons of water. However, the writer's experience leads him to 

 believe that in their present form the brands of dry lime-sulphur will not control 

 this pest as effectively as the better brands of lime-sulphur solution. 



In 1922 {14, p- 62) are reported tests with three calcium-sulphurs, 

 one barium-sulphur, and one sodium-sulphur used at the rate of 12 and 

 20 poimds to 50 gallons. In no case were the dry materials as 

 effective as liquid lime-sulphur, and the following conclusions are 

 drawn: "The above results show that it was practically impossible 

 to eradicate San Jose scale from infested peach trees by means of 



' Recommendation for points north of Hancock and Vermilion Counties. 



< Recommendation for Hancock and Vermilion Counties and points in same latitude or south. 



