444 Diseases of Economic Plants 



inch below — this regulation is accomplished by adding water 

 from time to time in the required amounts. It is preferable to 

 add water in small amounts at frequent intervals rather than 

 larger amounts less often, since the boiling is less interrupted. 

 When the boiling is completed, the level of the liquid should 

 be made up to the 50-gallon mark, if not already there. 

 It will be found to have a density of 24° to 25° Bamne when 

 cooled to about 16° C. (60° F.). 



One gallon of this solution may be diluted with 25 gallons 

 of water for summer use as a fungicide. Commercial solu- 

 tions, which usually test about 33° Baume, may be diluted 

 with 40 parts of water. The degree of dilution has relatively 

 slight effect, however, upon the fungicidal properties of the 

 solution, in comparison with the effect of thoroughness of 

 application, and the amount of dilution may vary within 

 wide limits. 



Another method for making lime-sulfur consists in the 

 use of live steam, furnished by a boiler, and led into wooden 

 barrels or tubs, in which the mixture is boiled (Fig. 223). 

 Large tubs provided with mechanical agitators are sometimes 

 used. Less water is needed than is called for by the formula 

 given above, because of the condensation of the steam used in 

 heating. 



Self-boiled lime-sulfur wash. — The self-boiled lime- 

 sulfur wash is a combination of lime and sulfur boiled 

 with only the heat of the slaking lime, and is primarily in- 

 tended for summer spraying of peaches. Peach foliage is so 

 susceptible to spray injury that ordinary Bordeaux mixture 

 cannot be used as a summer spray; neither can the sulfur 

 washes which contain any considerable quantity of sulfids 

 in solution. The self-boiled lime-sulfur wash, however, 

 when prepared as a mechanical mixture of lime and sulfur 

 with only a small percentage of the sulfur in solution, is not 

 injurious to peach foliage and has proved to be a good fun- 

 gicide. 



The mixture that appears to be the most satisfactory is 

 composed of 



