. A manual of veterinary hygiene. Veterinary hygiene. 168 VETEEINAEY HYGIENE. Fig. 33.—Ear Cockle, showing the nematoid worms (Smith). live on it after it has been saved ; the latter are by far the larger class. Ear cockle, Purples or Peiypercorn, is a disease of the ear of wheat, oats, and rye, due to a nematode worm. Vibrio tritici (Fig. 33), which enters the grain and converts it into a gall. Externally the gall is dark in colour, while its interior is filled with a cottony mass consisting of coiled up parasites. The animal parasites attacking food after the life of the plant, were especial
. A manual of veterinary hygiene. Veterinary hygiene. 168 VETEEINAEY HYGIENE. Fig. 33.—Ear Cockle, showing the nematoid worms (Smith). live on it after it has been saved ; the latter are by far the larger class. Ear cockle, Purples or Peiypercorn, is a disease of the ear of wheat, oats, and rye, due to a nematode worm. Vibrio tritici (Fig. 33), which enters the grain and converts it into a gall. Externally the gall is dark in colour, while its interior is filled with a cottony mass consisting of coiled up parasites. The animal parasites attacking food after the life of the plant, were especially studied by Megnin, to whose researches, noticed in : Magne's work, we are greatly indebted. Two kinds of parasite attack forage and grain, viz., insects and arachnidans. To the former belong Tcnehrio mollitor (Fig. 34) which infects forage, and T. farina which attacks grain. The latter is more serious than the former, for the larvee of the Tenebrio of grain live in the flour, whereas those of hay do not live in forage. In both cases they are very destruc- tive and reduce the food to powder. They are actively assisted by Bos- trichiis longus, B. spero- cephalus, and Ptiniis fur (Fig. 35); the larvae of all these develop in the food, and are conse- quently most destruc- tive. The Acari which live on grain and forage belong to the genera Oribata, Gamasus, Tyroglyplms, Cheyletus, Trombidium, and Argas. All these are most destructive, while the Gamasus (Fig. 36) and two species of Argas (Figs. 37, 38) cause such irritation to the Jig. 34.—Tenebrio mollitor, slightly magnified (Magne and Baillet).. 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 Smith, Frederick 1857-1929. New York : W. R. Jenkins
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