File:Experiments in the destruction of fly larvae in horse manure (1914) (14741098626).jpg

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Identifier: experimentsindes118cook (find matches)
Title: Experiments in the destruction of fly larvae in horse manure
Year: 1914 (1910s)
Authors: Cook, F. C. (Frank Cummings), 1877-1923 Hutchison, R. H. (Robert Harris), 1886- Scales, F. M. (Freeman Montague), 1880-
Subjects: Flies Control Horses Manure Handling
Publisher: Washington, D.C. : U.S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Destruction of Fly Larv/e in Horse Manure. Cage used in the chemical treatment of manure, showing the flytraps at the top, the small doorat the side through which samples of manure can be removed, the pan for collecting dripwater, and other details of the structure. (Original.) Jul. 118, U. S. Dept. of Agriculture. Plate III.
Text Appearing After Image:
DESTRUCTION OF ELY LARV2E IN HORSE MANURE. 0 on the cage to the left in Plate II. In this way the only light camefrom the opening into the flytrap at the top, and flies very soon afteremerging made their way up into the trap. The flies caught in thetraps were chloroformed and counted daily. At the end of each ex-periment the total numbers of flies from each cage were compared.The difference between the total numbers of flies from a cage oftreated manure and from the control cages is taken as an index ofthe effectiveness of the chemical. In any one set of experimentsthe manure used was all from the same source and, being in freshcondition, contained only eggs and larvae. It was mixed beforetransferring to the cages, but it is evident that under the condi-tions we could not be sure of an equal infestation in all cages. There-fore the chemicals were not regarded as having any larvicidal powerif the differences in the totals were small. OPEN-PILE EXPERIMENTS. In order to simulate natural

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no.118
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28 July 2014



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