UNITED STATES DEPARTMENT OF AGRICULTURE 



DEPARTMENT BULLETIN No. 1313 



Washington, D. C. 



January 26, 1925 



FUMIGATION AGAINST GRAIN WEEVILS WITH VARIOUS 

 VOLATILE ORGANIC COMPOUNDS 



By 



IRA E. NEIFERT, F. C. COOK, R. C. ROARK,and W. H. TONKIN 



Insecticide and Fungicide Laboratory, Miscellaneous 



Division, Bureau of Chemistry 



and 



E. A. BACK and R. T. COTTON, Bureau of Entomology 



CONTENTS 



Page 



Purpose of Investigation 1 



Experimental Procedure 2 



Effect of Volatile Organic Compounds on 



Weevils 3 



Relation between Volatility and Toxicity of 



Fumigants 19 



Effect of Fumigation on Weevils in the Pres- 

 ence of Grain 24 



Fire Hazard from Fumigation 28 



Page 



Effect of Fumigation on Milled and Baked 

 Products 34 



Additional Fumigation Tests with Ethyl Acetate 

 and Carbon Tetrachloride. 35 



Eflect of Ethyl Acetate-Carbon Tetrachloride 

 Fumigation on Germination of Seeds ... 38 



Summary 38 



Literature Cited 39 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1925 



