File:Sanitary entomology; the entomology of disease, hygiene and sanitation (1921) (14597848950).jpg

Identifier: sanitaryentomolo00pier (find matches)
Title: Sanitary entomology; the entomology of disease, hygiene and sanitation
Year: 1921 (1920s)
Authors: Pierce, W. Dwight (William Dwight), 1881-1967
Subjects: Insects as carriers of disease Beneficial insects Insect pests
Publisher: Boston : R. G. Badger
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ch Psoroptes communis ovis Hering causes SHEEPSCAB; variety hovis causes TEXAS ITCH of cattle; variety equi causesmange of horses and dogs. The psoroptic mites have piercing mandiblesbut do not burrow, although they may be greatly protected by scabformation over them. Among the dips used for the control of this itchare an 8 per cent kerosene emulsion used by Gillette; and the Rutherforddip prepared by steeping 1 pound tobacco and adding thereto 1 pound ofsulphur and 4 gallons of water, to be applied at 6 or 8-day intervals. CHORIOPTIC ITCH in the horse is caused by Chorioptes equi Ger-lach (symbiotes Verhe3^en) which attacks the hocks of the horse andcauses the hair to fall out and sores to form. It also causes an itchof cattle, goats, and sheep. This species has piercing mandibles butdoes not burrow. According to Banks a mixture of 1 part carbolicacid to 15 or 20 parts of oil will destroy the mite. SCALY LEG of chickens is caused by Cnemidocoptes mutaus Robin. 406 SANITARY ENTOMOLOGY
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Plate XXI^.— Scaly leg mite on chickens. Fig. 1 (Upper).—Scaly feet of chicken, caused by mite attack. Fig. 2 (Lower)—Scalyleg mites, greatly enlarged. (Bishojip.) DISEASES CAUSED OR CARRIED BY MITES AND TICKS 407 The mites form a crust of dead skin on the legs of the chickens (plateXXIV). The related species, Cnemidocoptes gaUinae Railliet, causes thehens to pluck their feathers. The mites work at the base of the feathers i ^ \ i Hpt: \ / , 1 k^^ yy ia L. ^^ -^4;;^ liayflH^^I ^^ F •• ■smssn i^ i ■■ ^™. .-:- ■ .. : <. ■ ., ._...,..™.,„-.-. —^.-Ji^^H Plate XXV.—Dipping scaly legs of chicken in crude oil (Bishopp.) and are called depluming mites. These mites are controlled by dippingin crude petroleum (plate XXV). DEMODECTIC ^lANGE, when caused by Demodex folliculorumSimon, gives rise to BLEPHARITIS, SEBORRHEA or BLACK-HEADS. Many animals and man are attacked by this mite. Probablya majority of persons harbor this mite. Demodectic mange is a commonand pr

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