1^ OHIO EXPERIMENT STATION: BULLETIN 194. 



CONTROL INSECTICIDES. 



Tkeltm&- Lime 20 lbs. 



jj- J Sulfur ' 15 lbs. 



suljur -wash. ^^^^^ ...SO^als. 



The lime, is placed in the boiling receptacle and water added, 

 (preferably hot) in small q'uantity until slacking is well under way. 

 The sulfur is then thrown on either dry or in the form of a paste, 

 and water is added as necessary to keep the mass sloppy. Upon 

 the completion of the slacking process, water to make IS gals, is 

 added and the whole is boiled for an hour. At the end of the boiling 

 period water, hot or cold, 'is added to make SO gals, and application 

 is made as soon as possible. A steam cooker is more satisfactory 

 than a kettle over a fire, as less stirring during the boiling process is 

 necessary and the mixture thus made is more even in quality. 



For more detailed instruction concerning the preparation of 

 this wash, the reader is referred to bulletin 169 of this station. 



It may be safely said of the lime-sulfur wash that it is the 

 most generally employed of the scale-destroying sprays. In its 

 use, however, care must be taken that the cooking is done thor- 

 oughly lest the lime and sulfur fail to combine properly, and 

 conditions must be favorable at the time of application. The spray 

 should not be applied when the temperature is below freezing. 



„ „ ' . Kerosene 2 g-als. 



Kerosene iLmulsion Soap % lb. 



Water 1 gal. 



Heat the water and dissolve the soap in it. While boiling hot, 

 pour into a convenient receptacle into which has previously been 

 placed the kerosene, and agitate thoroughly until a thick creamy 

 mass results from which the oil does not separate. A spray pump 

 serves admirably for this purpose, as the mixture may be pumped 

 back into Itself. Where the sprayer is not available an old churn 

 and dasher serve the purpose admirably. 



After the emulsion is perfect, it may be diluted with water to 

 the consistency desired which varies with the insect to be combatted. 

 Whale oil soaf !^^'® ^^ a very convenient spray to use where it 



solution ^® ^°* convenient to prepare kerosene emulsion. 



It is made by merely dissolving the soap in hot 

 water in the proportion desired. 



Kerosen^Limoid !^^^ principle involved in the preparation of 

 this emulsion is practically the same as in kero- 

 sene emulsion, the difference being that a very fine lime is used as 

 the emulsifying agent instead of soap. A special kind of lime con- 

 taining about Yi magnesia, is prepared by the Chas. Warner Co., 

 Wilmington, Del., and is called Limoid. Prof. C. P. Close of the 

 Delaware Experiment Station reports that any dry-slacked, finely 

 powdered lime is good for the purpose. 



