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Responses of Pests to Fumigation. IV.—The responses of Calandra spp. to Reduced Pressures*

Published online by Cambridge University Press:  10 July 2009

A. K. M. El Nahal
A. K. M. El Nahal
Affiliation:
Imperial College Field Station, Sunninghill, Berks.
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Extract

The direct action of reduced pressures, in the absence of any fumigant, on C. oryzae and C. granaria have been investigated in glass chambers of about 1 litre capacity. C. oryzae is sufficiently sensitive to make the direct effect of reducing the pressure within the range 2 to 10 cm. mercury of some practical importance, but C. granaria is more resistant. Mortality of both species increases for exposure periods of up to 8 hr. and for increased temperatures from 20°C. to 28°C. A large part of the observed mortality must be associated with enhanced water-loss from the insects at reduced pressures, as little response occurs when the atmosphere is kept saturated with water-vapour.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 44 , Issue 4 , December 1953 , pp. 651 - 656
Copyright
Copyright © Cambridge University Press 1953

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