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Responses of Pests to Fumigation. VI.—Water Losses and the Mortality of Calandra Spp. at reduced Pressures*

Published online by Cambridge University Press:  10 July 2009

H. J. Bhambhani
H. J. Bhambhani
Affiliation:
Imperial College Field Station, Sunninghill, Berks.
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Extract

The water loss and mortality of Calandra granaria (L.) and C. oryzae (L.) have been studied at low pressures in controlled humidities. The mortality of both species is closely associated with the loss of water under these conditions, a loss which is prevented by a high humidity in the surrounding air. C. oryzae is consistently more susceptible than C. granaria. Substantially linear relations were observed between water loss and decreasing relative humidity (range 0–85%), increasing period of exposure (range 4–16 hr.), and decreasing pressure (range 2–8 cm. mercury). At lower pressures (3–4 mm. mercury), the Water loss and mortality of both species were greatly reduced, suggesting that some physical change had occurred in the insects. A covariance analysis of the mortality response, using the loss of water as a concomitant variate, showed that there was no significant part of the mortality that was not accounted for by the water loss from the insects.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 47 , Issue 4 , December 1956 , pp. 749 - 753
Copyright
Copyright © Cambridge University Press 1956

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