438 MANUAL OF FRUIT DISEASES 



Self -boiled lime-sulfur. 



This fungicide is not a boiled solution, as might be inferred 

 from the name. It is in reality a mixture of lime and sulfur 

 resulting from the violent action of slaking lime in the presence 

 of finely divided sulfur. It was devised by Scott about 1907 

 for spraying peaches to protect them from the brown-rot. 

 When properly made it is the safest and most efficient fungicide 

 for the summer spraying of peaches. 



Prepare self-boiled lime-sulfur as follows : place ten pounds 

 of sulfur and ten pounds of stone-lime in a barrel. Add cold 

 water slowly to slake the lime, keeping the mass wet but not 

 submerged. Stir occasionally. Part of the large lumps of 

 lime may be kept out at first and added after slaking has 

 progressed to some extent, thus prolonging the slaking and 

 heating. When slaked, dilute at once to fifty gallons, and 

 apply as in the case of bordeaux. 



Soda-sulfur compounds of various types and under various 

 names are on the market. They are probably as effective as 

 the lime-sulfur compounds, but are more likely to cause injury 

 to the foliage. They must generally be used in greater dilution 

 and may not be combined with arsenate of lead. The so-called 

 "soluble-sulfur" and "sulfocide" are of this type. 



Sulfur-dust. 



Sulfur for dusting purposes must be especially fine. Finely 

 ground sulfur-flour is preferable. Powdered arsenate of lead 

 in the proportion of ten pounds to ninety pounds of sulfur 

 should generally be used, not only because of the insecticidal 

 value of the arsenate of lead, but also because of its effect on 

 the physical condition of the sulfur. By combining powdered 

 arsenate of lead and sulfur-flour, the resulting dust is fluffy and 

 consequently better distribution and better adhesive qualities 

 are obtained. The dilution of the sulfur with finely powdered 

 lime is not to be recommended because the lime appears to 

 have a detrimental effect on the fungicidal action of the sulfur. 



