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Effect of Low Holding Temperature During Pupal Instar on Adult Emergence, Pre-Oviposition and Fecundity of Cryptolaemus montrouzieri Mulsant (Coccinellidae: Coleoptera)

  • T. Ramesh Babu (a1) and K. M. Azam (a2)

Abstract

The effect of exposing 1, 3 and 5 days old pupae to 10°C for periods of 7, 14, 21 and 28 days on the emergence, pre-oviposition and fecundity of Cryptolaemus montrouzieri Mulsant was studied. The emergence was delayed significantly when 1 and 3 days old pupae were subjected to 10°C for 28 days when compared to 5 days old pupae. The initiation of oviposition was delayed with the prolongation of holding time. The fecundity of females emerging from 5 days old pupae subjected to 10°C for 21 days was found to be significantly higher than in any other treatment.

L'effet d'exposer des pupes âgées d'un, de trois et de cinq jours à 10°C pour des périodes de 7, 14, 21 et 28 jours sur l'émergence, la préoviposition et la fécondité de Cryptolaemus montrouzieri Mulsant a été étudié. L'émergence a été significativement retardée lorsque des pupes âgées d'un et de trois jours ont été soumises à 10°C pour 28 jours par rapport aux pupes âgées de cinq jours. L'initiation de l'oviposition a été retardée avec la prolongation de l'exposition. La fécondité des femelles qui ont émergées des pupes âgées de cinq jours soumises â 10°C pour 21 jours s'est avérée significativement supérieure que celles obtenues avec d'autres traitements.

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Babu, T. R. and Azam, K. M. (1987) Biology of Cryptolaemus montrouzieri Mulsant (Coccinellidae: Coleoptera) in relation with temperature. Entomophaga 32 (in press).
Bodenheimer, F. S. (1951) Citrus Entomology in the Middle East with Special Reference to Egypt, Iran, Palestine, Syria, Turkey. Dr. W. Junk, S. Gravenhage, The Netherlands.
Ray, A. (1978) Neuroendocrinological and cell-physiological studies of reproduction in some Indian Coleoptera. Morphological, histological, histochemical, autoradiographic and some preliminary electron microscopic investigations. Ph.D. thesis, Banaras Hindu University, Varanasi, India.
Snedecor, G. W. and Cochran, W. G. (1968) Statistical Methods. Oxford & IBH Publishing Co., New Delhi, India.

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