University of Montana 



Agricultural Experiment Station 



BOZEMAN, MONTANA 



BULLETIN NO. 133 



DECEMBER, 1919 



Seventeenth Annual Report of the 



State Entomologist 



of Montana 



The Alfalfa \Vco\il, a serious pest of alfalfa, which has spread northward 

 from Utah until it has now appeared on the Montana boundary in Idaho. 



BY 



R. A. COOLEY 



