Lime-Sulphur 123 



The essential poison of tobacco is extracted and ap- 

 pears on the market in several forms, as "black leaf," 

 "nicofume," "tobacine," etc., and are used either as fumi- 

 gants for greenhouses and hotbeds or as sprays for or- 

 chard insects such as woolly aphis, green aphis and some 

 other sucking insects. 



Miscible or Soluble Oils 



Several brands of soluble oils can be had on the market. 

 These are mostly petroleum products, so treated that they 

 mix quite freely with water, and can be used for such in- 

 sects as scale and aphis. These materials are efficient and 

 useful, but must be used with caution, as when too strong 

 they may cause serious injury to the plants. They should 

 be used at strengths of not less than one part of oil to fif- 

 teen parts of water. 



Lime-Sulphur 



Stone lime, 15 pounds. 



Sulphur, flour or flowers, 15 pounds. 



Water, 50 gallons. 



Slake the lime with some water in a large iron kettle. 

 As it is slaking add the sulphur gradually and mix it with 

 the slaking lime. Add ten or fifteen gallons of water to 

 the mass and boil for about one hour, -or until the mixture 

 becomes an orange red or greenish color. Then add the 

 remainder of the water to bring it up to a volume of 50 

 gallons, when it is ready for use. 



Instead of boiling this mixture over a fire, it may be 

 cooked by turning a jet of live steam from an engine boiler 

 into the liquid, proceeding in the same manner as when 

 the cooking is done in a kettle, except that the cooking 

 with steam can be done in a barrel or wooden tank. 



This mixture should be used only on dormant trees, as 

 it is liable to cause serious scalding if used at this strength 

 on foliage. 



This material is put up commercially in concentrated 

 form by a number of firms, directions for the use of which 



