. Bulletin of the Department of Agriculture. Agriculture. jn-RP"^-flu Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER. April 9, 1918 SOME BIOLOGICAL AND CONTROL STUDIES OF GASTROPHILUS HAEMORRHOIDALIS AND OTHER BOTS OF By W. E. Dove, Scientific Assistant, Insects Affecting Domestic Animals. CONTENTS. Page. Introduction L Brief life history of Gastrophilus 2 Historical Species differentiation 3 Distribution in the United States and prob- able dispersion 5 Larval collections and rearing 5 Larval infestation and
. Bulletin of the Department of Agriculture. Agriculture. jn-RP"^-flu Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER. April 9, 1918 SOME BIOLOGICAL AND CONTROL STUDIES OF GASTROPHILUS HAEMORRHOIDALIS AND OTHER BOTS OF By W. E. Dove, Scientific Assistant, Insects Affecting Domestic Animals. CONTENTS. Page. Introduction L Brief life history of Gastrophilus 2 Historical Species differentiation 3 Distribution in the United States and prob- able dispersion 5 Larval collections and rearing 5 Larval infestation and injuries 6 Bot-fly annoyance 13 Natural protection of horses 14 Page. Seasonal history of Gastrophilus 15 Gastrophilus hacmorrhoidalis (Linnaeus) 16 Gastrophilus nasalis (Linnaeus) 30 Gastrophilus intestinalis (De Geer) 32 Effect of death of host upon Gastrophilus larvse 34 Control studies 35 Summary 4^ Bibliography 50 INTRODUCTION. In compliance with requests from farmers and horse breeders of the Dakotas and Montana regarding "fly annoyance" to horses a survey of conditions was made in the autumn of 1914 by Mr. F. C. Bishopp. Under the direction of Dr. W. D. Hunter and the super- vision of Mr. Bishopp, investigations were undertaken m the follow- ing summer upon the European Gastrophilus hwmorrhoidahs, com- monly known in that section as the " ; The preliminary investigations in the summer of 1915 revealed the fact that the concentration of horses in pastures had rendered breeding conditions practically ideal for bot-flies, and that a most serious fly nuisance had developed which implicated three species of Gastrophilus. This concentration of horses in pastures may be attributed in part to the advent of gas engines, automobiles, and tractors, and to maximum prices, which has encouraged the breeder *Mr H B Bradford made the drawing illustrating the eggs of G^?f^S'^ Mr W. N.' Dovener made those illustrating the larva, and dorsal aspects of the adult
Size: 1836px × 1361px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
