. The chicken mite : its life history and habits. Dermanyssus gallinae) in experiment to go through life cycle. Date. Hour. Day. Stage of deveopment. Aug. 9p. 9 a. 9a. 9p. 9 a. 9p. 9a. 9a. \(9 [9 \9a. \9a. 9p. , /First-stage nymphs fed on fowl.\ First-stage nymphs are all fed. Second-stage nymphs molted from first-stage nymphs. /Second-stage nymphs fed on fowl.\Seeond-stage nymphs recovered fully fed. .\dults have molted from second-stage nymphs. /Females fed on fowl
. The chicken mite : its life history and habits. Dermanyssus gallinae) in experiment to go through life cycle. Date. Hour. Day. Stage of deveopment. Aug. 9p. 9 a. 9a. 9p. 9 a. 9p. 9a. 9a. \(9 [9 \9a. \9a. 9p. , /First-stage nymphs fed on fowl.\ First-stage nymphs are all fed. Second-stage nymphs molted from first-stage nymphs. /Second-stage nymphs fed on fowl.\Seeond-stage nymphs recovered fully fed. .\dults have molted from second-stage nymphs. /Females fed on fowl.\Females fully fed recovered. Eggs being deposited. /Some eggs still being deposited. \Some eggs have begun to hatch to larvse. Larvae have begun to molt to first-stage nymphs. Table III—Probable time in nature the mite (Dermanyssus gallinae) takes to go through life cycle. Day. First. Hour. Stage of development. fa. m ! Eggs laid. ( fa. m J (p. m Third /a m Eggs hatched to larvse. p«,-i,*t, ! /a. m Larvse molt to first-stase nvmphs m. First-stage nymphs feed. First-stage nymphs are molted to second-stage nymphs. Second-stage nymphs feed. Second-stage nymphs molt to adults. Females laid. The average rate of deposition is about four eggs per day; thatis, one egg in about hours. The rapidity with which the mite may reproducers amazing. Thepossible progeny of one female in five weeks is conservatively esti-mated at 1,631 individuals, or, considering the duration of life of afemale as eight weeks, her progeny would total 2,609 mites. LONGEVITY. As might be expected, since it feeds often and ordinarily does nothave to wait long for a host, as do many of the ticks, the mite livesa comparatively short time in the absence of food. The experimentsindicate that a certain amount of moisture and moderate temperaturefavor longevity, while extreme dryness and high temperatures areunfavorable factors. The mites die off much faster in the absenceof food during the hot
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