322 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



a better knowledge of the life history of the pest will undoubtedly 

 suggest. 



The Pea-aphis * 



Large green plant-lice often become so abundant on the foliage 

 and pods of garden-peas as to completely kill the plants. Prior 



FIG. 233. The pea-aphis (Macrosiphum pisi Kalt): winged and wingless 

 viviparous females and young enlarged. 



to 1899 the pea-aphis had not been a serious pest in this country, 

 but during that and the following season it caused a loss of several 

 million dollars to pea-growers on the Atlantic coast from North 



* Macrosiphum pisi Kalt. Family Aphididce. See Chittenden, Circular 

 43, Bureau of Ent., U. S. Dept. Agr.; Sanderson, Bulletin 49, Del. Agr. Exp. 

 Sta.; Folsom, Bulletin 134, 111. Agr. Exp. Sta. 



