. The chicken mite : its life history and habits. Fig. 2.—The chicken mite: Female mite engorged-with blood. Greatly enlarged. (Bishopp andWood.) LIFE-CYCLE EXPERIMENTS. The following outline gives an accurate record of the life cycle asworked out at Dallas, Tex.: First-stage nymph engorgement: August 6. 6 p. m. Several hundred first-stage nymphs put in jar with fowl. August 7, 9 a. m. 542 engorged first-stage nymphs nymph molting: August 8, a. m. Many have molted to second-stage nymph engorgement: August 9, p. m. All the second-stage nymphs
. The chicken mite : its life history and habits. Fig. 2.—The chicken mite: Female mite engorged-with blood. Greatly enlarged. (Bishopp andWood.) LIFE-CYCLE EXPERIMENTS. The following outline gives an accurate record of the life cycle asworked out at Dallas, Tex.: First-stage nymph engorgement: August 6. 6 p. m. Several hundred first-stage nymphs put in jar with fowl. August 7, 9 a. m. 542 engorged first-stage nymphs nymph molting: August 8, a. m. Many have molted to second-stage nymph engorgement: August 9, p. m. All the second-stage nymphs (perhaps 50 of the 542 died)put in jar with chicken. The nymphs are very active. August 10, 9 a. m. 263 engorged nymphs nymph molting and mating: August 11, 9 a. m. Many have molted. Several pairs found to be in positionof copulation. Bui. 553, U. S. Dept. of Agriculture. Plate The Chicken Mite (Dermanyssus gallinae). Upper left, eggs; upper center, larva, dorsal view; upper right, first-stage nymph before feeding;below, old roost showing spots of excrement. All much enlarged except the lower figure, whichis somewhat reduced. (Original.) TiffE CHICKEN MITE. 5 First engorgement of females: August 12, p. m. Put foregoing mites with fowl over night. August 13, 9 a. m. 70 engorged females recovered, and about 30 unfed put in separate tubes from the males and one female in a deposition of females: August 13, 7 p. m. (before). Two females have begun to deposit. August 14, 9 a .m. Five females are now depositing. August 14, 9 a. m. Five females are now depositing. August 15, a. m. 52 females are now depositing. August 15, p. m. 61 females are now depositing. August 15, 5 p. m. Same. August 16, a. m. 62 females are now depositing. August 16, 4 p. m. 64 females are now of eggs to larvae: August 16, a.
Size: 1554px × 1609px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1917
