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A comparison of the susceptibility of the rice varieties, IR8 and Warangal 1263, to attack by the gall midge, Pachydiplosis oryzae (Wood-Mason)(Dipt., Cecidomyiidae)

Published online by Cambridge University Press:  10 July 2009

W. W. D. Modder  and
A. Alagoda
W. W. D. Modder
Affiliation:
Department of Zoology, University of Ceylon, Peradeniya, Ceylon
A. Alagoda
Affiliation:
Department of Zoology, University of Ceylon, Peradeniya, Ceylon
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Extract

Daily observations were made of the developmental stages of Pachydiplosis oryzae (Wood-Mason) on laboratory-infested IR8 and W1263 rice seedlings at Peradeniya, Ceylon. The previously observed resistance of W1263 was attributed to the inhibition of moulting of first-instar larvae in 40% of the terminal shoot apices. In comparisons of the two varieties, differences in the following parameters were not significant or of no importance: the numbers of P. oryzae eggs laid and their hatching time, the mortality rates of the developmental stages, the number, body length and activity of the larvae and pupae at the terminal apices, and gall length.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 61 , Issue 4 , June 1972 , pp. 745 - 753
Copyright
Copyright © Cambridge University Press 1972

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References

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