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Pakistan Journal of Biological Sciences

Year: 2003 | Volume: 6 | Issue: 22 | Page No.: 1891-1896
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Authors

T.S. Syed

G.H Abro

Keywords

Research Article

Effect of Brassica Vegetable Hosts on Biology and Life Table Parameters of Plutella xylostella under Laboratory Conditions

T.S. Syed and G.H Abro
Different bracissca vegetables such as Brassica oleracea botrytis, B. oleracea capitata, B oleracea italica, B. napus, B. compestris, B. chenisis perkensis and Raphanus sativa were provided to newly hatched larvae of Plutella xylostella. The shortest and longest larval period of 9.45 and 10.95 days were recorded on B. oleracea botrytis and Raphanus sativa, respectively. Percent larvae pupating did not differ significantly, the lowest and highest percent survival to adult stage was recorded 58.3 and 76.7% on B. napus and B. oleracea italica. Whereas shortest and longest pupal period was recorded as 6.48 and 5.84 days on B.napus and B.oleracea capitata fed larvae. Pupal mass and fecundity of female showed that highest pupal mass and fecundity was recorded on B. oleracea fed larvae as compared to other Brassica vegetable crops. Similarly P. xylostella females preferred to lay more eggs on B.oleracea botrytis as compared with other hosts. Result also showed that females preferred to lay eggs on lower side as compared to upper side of the leaves. The life table parameters showed that net reproductive rate (Ro), was highest (89.71) when P.xylostella fed on B. olaracea botrytis, while the lowest Ro value of 26.77 was recorded when larvae were fed on B. napus. The intrinsic rate of increase (rm) and finite rate of increase (erm) were highest and lowest on B. olaracea botrytis and B.compestris, respectively.
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