Diseases of domesticated birds (1920) Diseases of domesticated birds diseasesofdomest00ward Year: 1920 EXTERNAL PARASITES 223 Fig. 54. Female fowl tick, as seen from above and beneath. Greatly enlarged. (Bishopp) njinphs. The feeding habit of nymphs is different in that they re- main attached to the fowl for but a short time, at night. Nymphs molt two or three times, alternating with feeding periods before they become adults. The adult female tick is shown in Fig. 54. Contrary to the habits of many ticks the adult female does not die after depositing eggs. She may alternate feeding period
Diseases of domesticated birds (1920) Diseases of domesticated birds diseasesofdomest00ward Year: 1920 EXTERNAL PARASITES 223 Fig. 54. Female fowl tick, as seen from above and beneath. Greatly enlarged. (Bishopp) njinphs. The feeding habit of nymphs is different in that they re- main attached to the fowl for but a short time, at night. Nymphs molt two or three times, alternating with feeding periods before they become adults. The adult female tick is shown in Fig. 54. Contrary to the habits of many ticks the adult female does not die after depositing eggs. She may alternate feeding periods on the fowl with egg laying for three, four, or even seven times. Ticks display a remarkable ability to exist for long periods with- out food. Seed ticks have lived for 5 months without food, those in the first nymphal stage for nine months, those in the second nvmphal stage for 15 months, and adults for 2Y2 years. Combating ticks. The difficulties associated with eradicating ticks fri ni a hen house are so great that in case the building is of little value, burning the structure would save time and trouble. Under conditions forbidding the employment of this extreme and effective measure, various substances may be sprayed on the wood- work and in the cracks. Crude Beaumont petroleum, carbolized whitewash, boiling water, strong kerosene emulsion and various creo- sote disinfectants have been recommended. Hot tar eliminates cracks and imprisons ticks. Ticks are very resistant to substances such as insect powder, kerosene and even fumigation with hydro-
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