. Bulletin of the Department of Agriculture. Agriculture. INSECTS.) UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 276 t Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. C. PROFESSIONAL PAPER September 29,1915 THE PEA APHIS WITH RELATION TO FORAGE CROPS By J. J. DAVIS, Entomological Assistant, Cereal and Forage Insect Investigations CONTENTS Introduction 1 Synonymy 2 Identity of the species occurring in America 4 Past history of the pest and its injuries 5 Character of attack 7 Effects on cattle of feeding them in- fested clover 7 Distribution and origin
. Bulletin of the Department of Agriculture. Agriculture. INSECTS.) UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 276 t Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. C. PROFESSIONAL PAPER September 29,1915 THE PEA APHIS WITH RELATION TO FORAGE CROPS By J. J. DAVIS, Entomological Assistant, Cereal and Forage Insect Investigations CONTENTS Introduction 1 Synonymy 2 Identity of the species occurring in America 4 Past history of the pest and its injuries 5 Character of attack 7 Effects on cattle of feeding them in- fested clover 7 Distribution and origin 8 Food plants 9 Description 12 Life history 26 Page Field observations 26 Generation experiments 27 Hatching of the egg 43 Molting 43 Age at which females begin reproducing 45 Reproductive period 49 Longevity "... 49 Fecundity of viviparous females ... 49 Sexual forms 50 Fecundity of oviparous females .... 51 Natural control 52 Methods of artificial control 54. WASHINGTON GOVERNMENT PRINTING OFFICET 1915 tasBBsmaaat. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
