DIV. INSECTS. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 109, Part TIL 



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



PAPERS ON INSECTS AFFECTING VEGETABLES. 



THE HORSERADISH WEBWORM. 



BY 



H. O. MARSH, 



Entomological Assistant. 



Issued January 30, 1913. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1913. 



