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For red spiders, fumigation with tobacco and hydrocyanic acid gas 

 are at best only partially successful. But where the plants can stand 

 it, flowers of sulfur, mixed with water at the rate of an ounce to a 

 gallon, sprayed over them is quite effective. With plants affected 

 by the sulfur it has been found that a 5-cent cake of castile soap 

 dissolved in about six gallons of water forms a spray which gives 

 good results. This spray should be allowed to stay on the plants 

 for two or three hours, after which it should be removed by syringing 

 with clean water. Two or three treatments with castile soap in this 

 way will greatly reduce the number of the red spiders. 



