Abstract
The effect of 3 insect growth regulators — methoprene, diflubenzuron and RO 13-5223, on the coccinelidChilocorus bipustulatus L. was studied in the laboratory. Feeding onChrysomphalus aonidum (L.) orAspidiotus hederae Vallot (Diaspididae) treated with the IGRs at the concentration of 0.025% a.i. revealed the following: diflubenzuron caused a complete mortality of 1 st instar larvae; methoprene and RO 13-5223 did not arrest larval development but inhibited pupation; fecundity of sexually mature females was not affected by the 3 IGRs but egg hatch was completely inhibited; egg viability was regained when IGR-exposed females had been transferred to an uncontaminated environment.
Résumé
On a étudié en laboratoire l'effet sur la coccinelleChilocorus bipustulatus L. de 3 régulateurs de croissance des insectes: le méthoprène, le diflubenzuron et le RO 13-5223. L'alimentation de la coccinelle avecChrysomphalus aonidum (L.) ouAspidiotus hederae Vallot (Diaspididae) traités avec ces produits à la concentration de 0,025 % a donné les résultats suivants: le diflubenzuron provoque la mortalité totale des larves du 1 er stade, le méthoprène et le RO 13-5223 n'arrêtent pas le développement larvaire mais inhibent la nymphose; la fécondité des femelles mûres n'est pas affectée par les 3 régulateurs de croissance mais l'éclosion de œufs ne se produit pas. La viabilité des œufs est recouvrée lorsque les femelles exposées aux régulateurs de croissance sont transférées dans un milieu non contaminé.
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Peleg, B.A. Effect of 3 insect growth regulators on larval development, fecundity and egg viability of the coccinelidChilocorus bipustulatus [Col.: Coccinelidae] . Entomophaga 28, 117–121 (1983). https://doi.org/10.1007/BF02372135
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DOI: https://doi.org/10.1007/BF02372135