﻿DRY SUBSTITUTES FOR LIQUID LIME-SULPHUR 25 



DISCUSSION OF RESULTS 



When used at the rate of 13 or 14 pounds to 50 gallons the dry 

 barium-sulphur gave an average of only 34 per cent control of hibernat- 

 ing scale. When the strength was increased to 26 or even 31 pounds 

 the effectiveness did not approach that obtained with standard 

 liquid lime-sulphur. The same lack of control is shown by the counts 

 of the first-generation scales on the new wood. 



SUMMARY 



The dry barium-sulphurs tested failed to show a satisfactory control 

 of the San Jose scale at any of the strengths used. In a general way 

 this material was about as effective as the other dry substitutes that 

 were tested. 



GENERAL SUMMARY 



The experiments here considered include 39 tests with dry cal- 

 cium-sulphur, 13 tests with dry sodium-sulphur, and 11 tests with 

 dry barium-sulphur. They were conducted under practical orchard 

 conditions in four different States and cover a period of three years. 

 Both apple and peach trees were used and conditions varied from a 

 moderate infestation to incrustation. Conditions lq the different 

 orchards were such that the natural increase of the scale varied 

 from very rapid to moderate. 



Under the conditions mentioned the results obtained are sufficient 

 to warrant the drawing of a general conclusion, at least for the 

 locahties in which these experiments were made. 



The foregoing tests show that the commercial samples of dry 

 calcium, sodium, and barium sulphurs, even when used at strengths 

 much greater than ordinarily employed, do not furnish a satisfactory 

 control of the San Jose scale. 



LITERATURE CITED 



(1) Anonymous. 



1922. Spraying programs for the orchard and fruit garden with directions 



as to spravs to be used. In Ohio Agr. Exp. Sta. Mo. Bui., 

 vol. 7, pp. 19-38. 



(2) 



1924. Directions for spraying fruits in Illinois. 111. Agr. Exp. Sta. Giro. 

 277, 24 pp., illus. 



(3) ACKERMAN, A. J. 



1923. Preliminary report on control of San Jose scale with lubricating- 



oil emulsion. U. S. Dept. Agr. Circ. 263, 18 pp., illus. 



(4) Baerg, W. J. 



1921, Spraying for San Jose scale. Ark. Agr. Exp. Sta. Bui. 177, 19 pp., 

 illus. 



(5) Britton, W. E. 



1923. Tests of sprays to control the San Jose scale. In Conn. Agr. Exp. 



Sta. Bui. 247, pp. 329-331. 



(6) Brock, W. S., and W. P. Flint. 



1919. Field experiments in spraying for control of San Jose scale, 1919. 

 111. Agr. Exp. Sta. Circ. 239, 4 pp. 



(7) Cooper, T. 



[1920]. Use of dry lime-sulphur in sprays. In Ky. Agr. Exp. Sta. Ann. 

 Rpt. 32 (1) (1919;, pp. 44-45. 



(8) Davis, J. J. 



1924. Comparative tests with dormant sprays for San Jose scale control. 



In .Jour. Econ. Ent., vol. 17, pp. 28.5-289. 



