390 Report of the Entomologists of the 



RESIN-LIME MIXTURE. 



A formula for making a spraying mixture to be used on cab- 

 bage was given in Bulletin No. 120 of this Station. Notes on the 

 use of the same mixture were also given in the Fifteenth Annual 

 Report under the heading " Notes on Cabbage Plusia and Reme- 

 dies for the Same." Tests of this mixture are now complete, 

 hence all previously published tests are repeated at the present 

 time. In the published notes above referred to, this mixture is 

 called a " Poisoned resin-lime mixture." This name is appropriate 

 only when the mixture contains Paris green or other arsenites and 

 is used against leaf-eating insects. As the mixture is likely to be 

 of value in other ways than as a carrier of insecticides a more ap- 

 propriate name will be simply resin-lime mixture. The name can- 

 not be shortened more than this for the reason that we already 

 have a resin mixture which is used against scale insects and a dis- 

 tinction must be made between the two. 



preparation. 



The resin-lime mixture is prepared as follows : 



Stock Solution. — 



Pulverized resin 5 pounds. 



Concentrated lye 1 pound. 



Fish oil or any cheap animal oil except tallow 1 pint. 



"Water 5 gallons. 



It takes about 2 hours to prepare this mixture. The oil, 

 4 more gallons of hot water 1 should be placed in iron kettle 

 and heated until the resin is softened, after which the solution of 

 concentrated lye, 2 or potash, should be carefully added and the 



1 In the bulletin and report above referred to it was recommended that the 

 oil and resin be placed in the kettle and heated before adding the water. The 

 resin is softened most readily by this method but the oil and resin get so hot, 

 that, when water is added, the latter is converted into steam and the whole 

 mass is liable to be thrown out of the kettle. 



2 The solution of lye should be prepared according to the formula for mak- 

 ing hard soap, which is always given on the can. 



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