一、引言前后盘吸虫类(Paramphistomata)种类繁多,根据斯克里亚平院士(Skrjabin,1949)編著动物和人体吸虫第三卷記載共有10科70属165种,其中寄生于牛羊体中的有47种。近年来各地学者继续进行此項研究,又有許多新种发現(Willmott,1950;Di...一、引言前后盘吸虫类(Paramphistomata)种类繁多,根据斯克里亚平院士(Skrjabin,1949)編著动物和人体吸虫第三卷記載共有10科70属165种,其中寄生于牛羊体中的有47种。近年来各地学者继续进行此項研究,又有許多新种发現(Willmott,1950;Dinnik;1954;Golvan,Chaband et Grelillat,1957;1958;江溥欽,1959)。因此寄生于牛羊的这一类吸虫,已知有50余种,这些吸虫的成虫寄生于牛羊胃腸中,吸着帖膜上,夺取营养,致使宿主体驱衰弱,影响牛羊的体重增长,耕牛的耕作能力,和乳牛的产乳量都很大;尤以牛羊感染囊蚴初期。展开更多
Size and weight measurements were made for all the life stages of Bemisia tabaci (Gennadius) B biotype from field grown cotton ( Gossypium hirsutum L. ) and cantaloupe ( Cucumis melo L., var. cantalupensis )in Phoenix...Size and weight measurements were made for all the life stages of Bemisia tabaci (Gennadius) B biotype from field grown cotton ( Gossypium hirsutum L. ) and cantaloupe ( Cucumis melo L., var. cantalupensis )in Phoenix, AZ and Fargo, ND, USA in 2000 and 2001. Nymphal volumes were derived from the measurements.The average nymphal volume increase for settled 1 st to the late 4th instar was exponential. The greatest increase in body volume occurred during development from the 3rd to early 4th instar. Nymphs on cotton leaves were wider,but not longer compared with those on cantaloupe. Ventral and dorsal depth ratios of nymphal bodies from 1st tolate 4th instars from cantaloupe leaves were significantly greater compared with those from cotton leaves. During nymphal development from 1st to 4th instar, the average (from the two host species) ventral body half volume in-creased by nearly 51 times compared with an increase of 28 times for the dorsal body half volume. Adult female and male average lengths, from heads to wing tips, were 1 126 μm and 953 μm, respectively. Average adult fe-male and male weights were 39 and 17 μg, respectively. Average widths, lengths, and weights of eggs from cottonand cantaloupe were, 99 μm, 197 μm, and 0.8 μg, respectively. Average widths, lengths, and weights for exu-viae of non-parasitized nymphs from both cotton and cantaloupe were 492 μm, 673 μm, and 1.20 μg, respective-ly; and widths, lengths, and weights of parasitized nymph exuviae were 452 μm, 665 μm, and 3.62 μg, respec-tively. Both exuviae from non-parasitized and parasitized nymphs from cotton leaves were wider, longer, and heavier than those from cantaloupe leaves.展开更多
文摘一、引言前后盘吸虫类(Paramphistomata)种类繁多,根据斯克里亚平院士(Skrjabin,1949)編著动物和人体吸虫第三卷記載共有10科70属165种,其中寄生于牛羊体中的有47种。近年来各地学者继续进行此項研究,又有許多新种发現(Willmott,1950;Dinnik;1954;Golvan,Chaband et Grelillat,1957;1958;江溥欽,1959)。因此寄生于牛羊的这一类吸虫,已知有50余种,这些吸虫的成虫寄生于牛羊胃腸中,吸着帖膜上,夺取营养,致使宿主体驱衰弱,影响牛羊的体重增长,耕牛的耕作能力,和乳牛的产乳量都很大;尤以牛羊感染囊蚴初期。
文摘Size and weight measurements were made for all the life stages of Bemisia tabaci (Gennadius) B biotype from field grown cotton ( Gossypium hirsutum L. ) and cantaloupe ( Cucumis melo L., var. cantalupensis )in Phoenix, AZ and Fargo, ND, USA in 2000 and 2001. Nymphal volumes were derived from the measurements.The average nymphal volume increase for settled 1 st to the late 4th instar was exponential. The greatest increase in body volume occurred during development from the 3rd to early 4th instar. Nymphs on cotton leaves were wider,but not longer compared with those on cantaloupe. Ventral and dorsal depth ratios of nymphal bodies from 1st tolate 4th instars from cantaloupe leaves were significantly greater compared with those from cotton leaves. During nymphal development from 1st to 4th instar, the average (from the two host species) ventral body half volume in-creased by nearly 51 times compared with an increase of 28 times for the dorsal body half volume. Adult female and male average lengths, from heads to wing tips, were 1 126 μm and 953 μm, respectively. Average adult fe-male and male weights were 39 and 17 μg, respectively. Average widths, lengths, and weights of eggs from cottonand cantaloupe were, 99 μm, 197 μm, and 0.8 μg, respectively. Average widths, lengths, and weights for exu-viae of non-parasitized nymphs from both cotton and cantaloupe were 492 μm, 673 μm, and 1.20 μg, respective-ly; and widths, lengths, and weights of parasitized nymph exuviae were 452 μm, 665 μm, and 3.62 μg, respec-tively. Both exuviae from non-parasitized and parasitized nymphs from cotton leaves were wider, longer, and heavier than those from cantaloupe leaves.
