ated by the slaking will be sufficient to cause the sulphur and lime to 

 unite. If considerable quantities are being prepared, it will be well 

 to slake the lime in boiling water in an iron kettle (never in copper) and 

 keep the mixture boiling for a short time after the sulphur has become 

 well incorporated. The mixture should be constantly stirred until it 

 is smooth and even. Five pounds of sulphur and 5 pounds of lime will 

 make, after diluting, 100 gallons of spray mixture. This may be used 

 stronger, if desirable, but care must be taken not to injure the plants. 



Lye-sulphur. — "Mix 20 pounds flowers of sulphur into a paste with 

 cold water, add 10 pounds of pulverized caustic soda (98 per cent). 

 The dissolving lye will liquefy the sulphur and boil. Water must be 

 added from time to time to prevent burning until a concentrated solu- 

 tion of 20 gallons has been obtained. Two gallons of this is sufficient 

 for 50 gallons of spray, giving a strength of 2 pounds of sulphur and 1 

 of lye to 50 gallons of water." a This has been successfully used 

 against the orange red spider in California. 



Kerosene emulsion. — Dissolve 1 pound hard or 1 quart soft soap 

 in 1 gallon hot water, add 1 gallon coal oil, and emulsify. The most 

 thorough and feasible method is to pump the spray mixture back upon 

 itself until it is thoroughly emulsified. Dilute to 10 gallons and use as 

 soon as possible. With the recent advent of a certain naphtha soap 

 which will emulsify without heating, kerosene emulsion can be readily 

 made in the field with cold water. 



Water. — This treatment is quite commonly used by greenhouse men 

 in fighting red spider in propagation houses, conservatories, and parks. 

 The water is driven onto the plants in a fine spray with considerable 

 force. 



Approved: 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, October 30, 1905. 



a 1903: Marlatt, Fanners' Bui. 172, U. S. Dept. Agr., p. 41. 

 O 



