THE GREEN-BUG OR SPRING GRAIN- 
APHIS: HOW TO PREVENT ITS PERI- 
ODICAL OUTBREAKS. 
CONTENTS. 
Page. Page. 
Distribution-j=s.—.eeeew = ee 3. J aBINeronr alereniemite sy = se ee 4 
PEO MMII om ee oe 4 | @ontrolemethods!= 222 — = 2 Ss 8 
DISTRIBUTION. 
HE GREEN-BUG (fig. 1) is a small, soft-bodied aphid or 
plant-louse which is distributed throughout nearly the entire 
United States and extends into Canada (fig. 2). Its injuries prin- 
Fig. 1.—The spring grain-aphis: Wingless viviparous female. Wnlarged; actual size, 
2mm. (Webster and Phillips.) 
cipally are inflicted throughout the Mississippi Basin, where it often 
has been responsible for many millions of dollars’ worth of dam- 
age to the small grains. It is estimated to have caused in one 
45953°—21 3 
