290 SCHOOL AND HOME GARDENING 



emulsion should be perfect and will lia\e the consistency of cream. 

 This is ready to be diluted as wanted for use. 



Kerosene emulsion can be used successfully during the 

 summer growing period for combating plant lice and other 

 soft-bodied insects. Dilute the above emulsion with fifteen 

 parts of water. This may be used either in the garden or on 

 plants in hotbeds or windows. For the red spider and other 

 plant mites which frequently affect house plants, add about 

 one ounce of flowers of sulfur to one gallon of the diluted 

 emulsion. It is used much stronger on scale insects and soft- 

 bodied eating larvse and larger plant bugs. About seven to 

 ten parts of water will be weak enough. Emulsion is applied 

 with a spray pump, using a very fine nozzle. 



6. Making Concentrated Lime-Sulfur. — Use thirty pounds of 

 powdered flowers of sulfur, fifteen pounds burned lime and fifteen 

 gallons of water. Wet the sulfur and slake the lime. Add both of 

 these to fifteen gallons of boiling water. Boil the mixture for forty 

 to sixty minutes, or until well dissolved. This may be kept in a 

 closed vessel until wanted. A layer of oil on top will keep out the air. 



This is called home-made concentrated lime-sulfur. Its 

 chief purpose is the fighting of San Jose scale and other scale 

 insects. Be sure it is diluted with about nine times its volume 

 of water for winter use on apple trees. The rule for dilution 

 requires that the specific gravity of a liquid be found. Divide 

 the decimal part of this number by three hundredths (.03) 

 and the quotient will tell the number of times to dilute the 

 liquid. For example, if this specific gravity equals 1.37, 

 divide .27 by .03, giving 9. Then dilute the liquid with nine 

 times its volume of water for winter use. As a summer spray 

 on apples and potato vines it should be diluted with three 

 times as much water as for winter use. 



Instead of boiling lime-sulfur in an open kettle, as is done 

 in the above plan, fruit growers and gardeners buy the lime- 

 sulfur ready made. A number of commercial preparations 

 of lime-sulfur are now sold. Each is supposed to be of about 



