296 



Bulletin 2^6. 



used throughout the season. Fourth, the commercial concentrated 

 lime-sulfur solutions boiled under factory conditions. In all except 

 the self-boiled mixture, lime and sulfur are boiled together, the calcium 

 combining chemically with the sulfur in various proportions to form 

 a soluble product. The dilution of a concentrated preparation for a 

 certain purpose must be governed by the density of the solution used. 

 This can most readily be obtained by the use of a Baume or a specific 

 gravity hydrometer. For example, we used with good success Niagara 

 lime-sulfur solution which tested about 32° Baume, 1.285 specific 

 gravity, diluted 1-15. A grower may wish to know how he can dilute a 

 a home-boiled solution equivalent to this. Reference to table 4 below will 

 help to solve such problems. In the case cited above the specific gravity 

 of the diluted solution was about 1.019, or between 2° and 3° on the 

 Baume scale. It is probable, therefore, that a home-boiled concentrated 

 solution prepared according to Cordley and Stewart diluted to this den- 

 sity would have approximately the same fungicidal value as the com- 

 mercial solution which we used diluted 1-15. 



Table No. 4 

 Giving Dilutions to Various Concentrates 



* Dilutions for scale after Van Slyke, L. L. and Parrott, P. J., N. Y. Geneva 

 Bui., 319 & 320:10, Pop. Ed. 



Formulae and directions jar preparing lime-sulfur solutions, bordeaux 

 mixture, etc., for control of Peach Leaf Curl. 



I. Home-boiled dilute solution. — This is the common home-boiled 

 lime-sulfur 15-20-50 formula, which has been much used by growers 

 for the control of San Jose scale. As applied for scale it is effective 

 against Peach Leaf Curl. 



