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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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References

Cotton, R. T., Wagnek, G. B. & Young, H. D. (1937).Oxygen as a factor in vacuum fumigation.—J. econ. Ent., 30 p.560.Google Scholar
El Nahal, A. K. M. (1953).Responses of pests to fumigation. IV. The responses of Calandra spp. to reduced pressures.—Bull. ent. Res. 44 pp. 651–656.CrossRefGoogle Scholar
Levenbook, L. (1951).The effect of carbon dioxide and certain respiratory inhibitors on the respiration of larvae of the horse bot fly (Gastrophilus intestinalis de Geer)—J. exp. Biol., 28 pp.181–202.CrossRefGoogle ScholarPubMed
Livingstone, E. M. &Reed, W. D. (1940).Water vapor as a factor affecting the survival of Ephestia elutella and Lasioderma serricorne at reduced pressure.—Ann. ent. Soc. Amer., 33 pp.583–587.CrossRefGoogle Scholar
Moore, William &Carpenter, E. L. (1938). The fumigation of insects with hydrocyanic acid: effect of different air pressures.—J. econ. Ent., 31 pp.419–426.CrossRefGoogle Scholar
Salmond, K. F. (1953) Responses of pests to fumigation. II. Toxicity of hydrogen cyanide to Calandra spp. under reduced pressure.—Bull. ent. Res., 44 pp.225–230.CrossRefGoogle Scholar
Solomon, M. E.(1945) The use of cobalt salts as indicators of humidity and moisture.—Ann. appl. Biol., 32 pp.75–85.CrossRefGoogle Scholar
Wigglesworth, V. B. (1935).The regulation of respiration in the flea, Xenopsylla cheopis Roths. (Pulicidae).—Proc. roy. Soc. Lond., (B) 118 pp.397–419.Google Scholar