Abstract
In 1978 and 1979 in Central Bohemia the census of aphid populations on bean, sugar beet, cereals, maize, and alfalfa were taken at the time when overwinteredCoccinella septempunctata L. (1) settled and (2) the ovarioles of females ripened. Settling occurred immediately after aphid immigration. Minimum aphid density required for settling was estimated to about 10 aphids per 1 m2 of field area. The aphid density at the time of ovariole ripening equaled 1 aphid per 200–400 cm2 of leaf area.
Résumé
En 1978 et 1979 on a procédé, en Bohème Centrale, au dénombrement des populations de pucerons sur haricot, betterave sucrière, céréales, maïs et luzerne, lorsqueCoccinella septempunctata L. en hivernage (1) colonise les cultures et (2) que les ovarioles des femelles mûrissent. L'arrivée des coccinelles intervient aussitôt après l'immigration des pucerons. La densité minimum en pucerons à cette époque a été évaluée à environ 10 pucerons par m2 de champ; cette densité au moment de la maturation des ovarioles de la coccinelle équivaut à ` puceron pour 200 à 400 cm2 de surface foliaire.
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Honěk, A. Population density of aphids at the time of settling and ovariole maturation inCoccinella septempunctata [Col.: Coccinellidae] . Entomophaga 25, 427–430 (1980). https://doi.org/10.1007/BF02374705
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DOI: https://doi.org/10.1007/BF02374705