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BIOLOGY, LIFE TABLES, AND INTRINSIC RATE OF INCREASE OF THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE)1

Published online by Cambridge University Press:  31 May 2012

H. J. Herbert
Affiliation:
Agriculture Canada, Research Station, Kentville, Nova Scotia B4N 1J5

Abstract

Development of the European red mite, Panonychus ulmi (Koch), in Nova Scotia was studied at three constant temperatures to construct a life table and establish the intrinsic rate of development. The threshold temperature for development was 10.6°C. The duration from the beginning of the egg stage to adult for females was 31.2, 20.5, and 14.0 days and for males 21.9, 19.6, and 12.8 days at 15°, 18°, and 21°C, respectively. The duration in degree-days above 10.6°C for females was 137.3, 151.7, and 145.2 and for males 128.0, 144.9, and 133.1 at the same three temperatures. The duration of the preoviposition period decreased, duration of the oviposition period remained constant, and the number of eggs laid increased with temperature. Life tables were constructed at 15°, 18°, and 21°C; the intrinsic rates of increase were 0.56,.092, and.134; net reproduction rates 10.06, 13.50, and 17.37; and mean generation times were 41.4, 28.3, and 21.3 days, respectively.

Résumé

On a étudié le développement du tétranyque rouge du pommier (Panonychus ulmi (Koch)) en Nouvelle-Écosse à trois températures constantes pour établir un cycle biologique et le taux intrinsèque de développement dont la température seuil est de 10.6°C. L’intervalle entre le début du stade oeuf et l’âge adulte pour les femelles est de 31.2, 20.5 et 14 jours, et de 21.9, 19.6 et 12.8 jours pour les mâles à 15, 18 et 21°C respectivement. Le nombre de degrés-jours supérieurs à 10.6°C est de 137.3, 151.7 et 145.2 pour les femelles et de 128, 144.9 et 133.1 pour les mâles respectivement aux trois mêmes températures. La durée de la période d’ovipositin demeure constante et le nombre d’oeufs pondus augmenté avec la température. Pour des cycles biologiques élaborés à 15, 18 : et 21°C, les taux intrinsèques de croissance sont de 0.56, 0.92 et 0.134, les taux nets de reproduction sont de 10.06, 13.5 et 17.37 et les intervalles moyens de génération sont de 41.4, 28.3 et 21.3 jours respectivement.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1981

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