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BIOLOGY, LIFE TABLES, AND INNATE CAPACITY FOR INCREASE OF THE TWOSPOTTED SPIDER MITE, TETRANYCHUS URTICAE (ACARINA: TETRANYCHIDAE)1

Published online by Cambridge University Press:  31 May 2012

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

The threshold temperature of development, life table, and innate capacity for increase of the twospotted spider mite, Tetranychus urticae Koch, were established from life stage development studies at constant temperatures. The threshold for development was determined to be 10.0°C. The durations in degree-days above 10°C from the beginning of the egg stage to adult for females were 141.3, 152.3, and 139.8; for males 134.2, 144.7, and 135.2 at 15°, 18°, and 21°C, respectively. Life tables were constructed and innate capacity for increase was .069, .156, and .372; net reproduction rate 20.8, 38.4, and 58.1; and mean generation time 44.0, 23.4, and 10.9 at 15°, 18°, and 21°C, respectively.

Résumé

On a établi la température seuil de développement, le cycle biologique et la capacité innée de multiplication du tétranyque à deux points, Tetranychus urticae, a %artir d’études des stades évolutifs de développement à températures constantes. La température seuil est de 10°C. Les intervalles en degrés-jours dépassant 10 °C du début du stade oeuf au stade adulte sont de 141,3, 152,3, et 139,8 pour les femelles et de 134,2 144,7 et 135,2 à 15, 18 et 21°C pour les mâles respectivement. On a reconstitué les cycles biologiques et on a constaté que la capacité innée de multiplication est de 0,069, 0,156 et 0,372, les taux de reproduction nette sont de 20,8, 38,4 et 58,1 et l’intervalle moyen de génération est de 44, 23,4 et 10,9 à 15, 18 et 21°C respectivement.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 5 , May 1981 , pp. 371 - 378
Copyright
Copyright © Entomological Society of Canada 1981

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