Abstract
Avermectin at 1 ppm was slightly toxic by contact to the different immature stages of the predacious miteAmblyseius gossipi El-Badry. When immatures ofA. gossipi ingested treated prey on clean leaf discs, the toxicity increased and the resulted ΦΦ oviposited at a significantly lower rate. In contrast, dicofol at 250 ppm was extremely toxic by contact and caused a significant mortality to the immatures when it was ingested. Female mortality increased and fecundity decreased as the time of feeding treated prey increased from 24 h to 192 h. In case of dicofol a permanent depression in reproduction was recorded after feeding treated prey for 144 h.
Females ofA. gossipi suffered a depression in reproduction when fed on prey formerly kept on plant leaves treated with avermectin. This depression was reported, only, after 192 h of feeding on prey previously reared on leaves treated with dicofol.
Résumé
L'avermectin à la dose de 1 ppm était légèrement toxique par contact vis-à-vis des différents stades immatures de l'Acarien prédateurAmblyseius gossipi El-Badry. Quand les stades immatures d'A. gossipi absorbaient des proies traitées sur des disques de feuilles propres, la toxicité augmentait et les femelles en résultant pondaient moins.
Par opposition, le dicofol à la dose de 250 ppm étiat extrêmement toxique par contact et provoquait une mortalité significative chez les stades immatures qui l'absorbaient. La mortalité des femelles augmentait et leur fécondité décroissait à mesure que le temps de prédation des proies traitées augmentait de 24 à 192 h. Dans le cas du dicofol, une réduction permanente de la reproduction s'observait après 144 h d'alimentation sur proies traitées.
Les femelles d'A. gossipi manifestaient une chute de reproduction quand elles étaient nourries de proies gardées antérieurement sur des feuilles traitées à l'avermectin. Cette chute n'était signalée qu'après 192 h d'alimentation sur proies antérieurement sur feuilles traitées au dicofol.
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Reda, A.S., El-Banhawy, E.M. Effect of avermectin and dicofol on the immatures of the predacious miteAmblyseius gossipi with a special reference to the secondary poisoning effect on the adult female [Acari: Phytoseiidae]. Entomophaga 33, 349–355 (1988). https://doi.org/10.1007/BF02372625
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DOI: https://doi.org/10.1007/BF02372625