131 



water should be added if the mixture becomes too thick. 

 Then let it boil for about five minutes. The actual time de- 

 l^ends on the kind of lime that is used but it is safe to let it 

 cook until all active slaking has ceased. The mixture should 

 boil very vigorously for a few minutes. Just as soon as this 

 active boiling ceases, add enough water to quickly cool the 

 mixtui'c. Strain the material into the spray tank adding 

 enough water to e(|ual the amount called for in the formula 

 8 pounds of lime and 8 pounds of sulfur should be used for 

 every 50 gallons of spraying material. Some of our growers 

 use a self-boiled mixture made by allowing the boiling to 

 continue for a longer time, for apples with very successful re- 

 sults. There is less danger of burning than with the con- 

 centrated mixtui-e but the <'ontrol of fungus diseases is not 

 as perfect. Let me give you one warning in connection witn 

 the use of self-Iioiled lime-sulfur for the -peach: if you let 

 the mixture l)oil too long, you are likely to get just as seri- 

 ous injury from the self-boiled lime-sulfur mixture as you 

 would from the concentrated mixture. Stop all further ac- 

 tion Iiy the addition of plenty of t-old water just as soon as 

 tlie active boiling ceases. 



MK. WILDER : I would like to ask if there is a fixed 

 staiidai-(l for tlie concentrated lime-sulfur? 



PROF. FARLEY: A fixed standard from the manufac- 

 turers' standpoint ? 



MR. WILDER: Yes. and also the user's standpoint; can 

 Ave get the same concentrated lime- sulfur of all manufac- 

 turers ? 



PROF. FARLEY: I doulit if you can get material of 

 exactly the same strength frcnn all manufacturers, but the 

 f:trength is specified on the label, which you will find on the. 

 barrel. The strength is determined l)y a specific gravity 

 tfst. Commercial concentrated lime-sulfur mixture should 

 l;ave a specific gravity of at least 1.30. 



QUESTION: I Avould like to ask the strength of that 

 mid-summer spray between June and July for the green 

 fungus. 



