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Studies onAphytis coheni, a parasite of the California red scale,Aonidiella aurantii in Israel

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Abstract

Studies on the development, fecundity, nutrition and the influence of temperature and humidity onAphytis coheni DeBach, an ectoparasite of the California red scale,Aonidiella aurantii (Maskell) were conducted in an effort to explain the current distribution ofA. coheni in citrus groves in Israel.

Résumé

Les populations d'Aphytis coheni DeBach, ectoparasite d'Aonidiella aurantii (Maskell), sont en général faibles dans les vallées chaudes et sèches d'Israël. La durée de développement aux conditions du laboratoire (28°C) est de 12 jours, et les femelles fécondées et vierges pondent environ 25 œufs durant toute leur vie. Parmi les différentes nourritures naturelles c'est le nectar d'agrumes qui donne les meilleurs résultats, mais plusieurs miellats de cochenilles peuvent aussi prolonger la longévité des adultes deA. coheni. A la suite de l'exposition de femelles adultes à 35°C pendant cinq heures on constate dans la descendance un nombre réduit de mâles et de femelles, et les mâles adultes sont incapables de féconder les femelles. Les températures journalières élevées (35°C pendant 6 heures) ne sont pas nuisibles pour le développement de tous les stades de ce parasite. L'exposition à des températures extrêmes (1°C;37°C) a causé une grande mortalité des adultes, qui fut modifiée considérablement par une humidité élevée. Ces résultats nous serviront à comprendre la survie de populations d'A. coheni d'une faible densité dans les zones très chaudes d'Israël.

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Authors and Affiliations

  1. Faculty of Agriculture, Rehovot, Israel

    Z. Avidov, M. Balshin & U. Gerson

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  1. Z. Avidov
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  2. M. Balshin
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  3. U. Gerson
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This research has been financed in part by Grant No. FG-Is-227 made by the United States Department of Agriculture under P.L. 480.

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Avidov, Z., Balshin, M. & Gerson, U. Studies onAphytis coheni, a parasite of the California red scale,Aonidiella aurantii in Israel. Entomophaga 15, 191–207 (1970). https://doi.org/10.1007/BF02371871

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