198 OHIO EXPERIMENT STATION: BULLETIN 194. 



CONTROL INSECTICIDES. 

 Thelimt- Lime .............. ...... .................. 20 Ibs. 



The lime is placed in the boiling- receptacle and water added. 

 (preferably hot) in small quantity 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 15 g-als. 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 50 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 gals. 



Kerosene Emulsion 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. 



TT . 7 , ., This is a very convenient spray to use where it 



Whale oil soap . . . 



solution 1S n convenient to prepare kerosene emulsion. 



It is made by merely dissolving the soap in hot 

 water in the proportion desired. 



T r T -j The principle involved in the preparation of 



Kerosene-Lsimota ' . . . , 



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 */>> 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. 



