U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 109, Part V. 



L. O. HOWARD, Entomologist and Chief of Bureau. 



PAPERS ON INSECTS AFFECTING VEGETABLES. 



ARSENITE OF ZINC AND LEAD CHRO 

 MATE AS REMEDIES AGAINST THE 

 I COLORADO POTATO BEETLE. 



BY 



FRED A. JOHNSTON, 



Entomological Assistant. 

 [In cooperation with the Virginia Truck Experiment Station.] 



Issued April 5, 1912. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1912. 



.2,-2 134^ 



