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. 
