STATE OF ILLINOIS 



DEPARTMENT OF REGISTRATION AND EDUCATION 



NATURAL HISTORY SURVEY DIVISION 



SIGNIFICANCE OF PESTICIDE RESIDUES: 

 PRACTICAL FACTORS IN PERSISTENCE 



George C. Decker 



Illinois Natural History Survey 

 Biological Notes No. 56 



Urbana, Illinois March, 1966 



MTDRAl HISTORY mm 

 f^^^ ! ' 1966 



[.mm 



