Appendix B 



281 



salt and stir until thoroughly mixed. Boil this mixture 

 for from forty-five to sixty minutes to thoroughly 

 dissolve the sulfur. The sulfur dissolves most easily 

 in a thin milky solution of lime, and, for this reason, 

 no more water is used in dissolving the sulfur than is 

 necessary to keep the mixture from becoming pasty. 

 When the sulfur is thoroughly dissolved, pass the solu- 

 tion through a strainer and dilute to the desired con- 

 centration with hot water. The mixture should be pre- 

 pared just as needed, and applied while still warm. 



Kerosene Preparations. Kerosene oil is an external 

 irritant and is very effective in killing insects. It can 

 not be applied to plants, however, in its crude form, 

 without producing serious injury. Resort is had, there- 

 fore, to various substances to dilute and carry the oil, 

 such as soap-suds, milk, milk of lime, or even water 

 alone, automatically mixed with the water in forming 

 the spray. Kerosene preparations 

 should be applied to plants with great 

 caution. They are very efficient in 

 fighting certain injurious insects, but 

 if not properly applied, serious injury 

 to the plant may result. 



Kerosene Emulsion. Dissolve one 

 pound of Naphtha soap in two and 

 one-half gallons of water. Then add 

 two and one-half gallons of kerosene 

 to the solution and thoroughly mix by 

 pumping the entire mixture through 

 a bucket sprayer. Fig. 179. Now di- 

 lute to from twenty to thirty gallons 

 as desired. Apply while fresh. Used for scale and other 

 sucking insects. 



Fig. 179. Hand bucket 

 spray pump. A 

 longer hose than that 

 shown is needed |for 

 convenient using. 



