Abstract
We report and discuss effects of four insect growth regulators: buprofezin, fenoxycarb pyriproxyfen and chlorfluazuron, at concentrations recommended for agricultural use on six species of natural enemies of homopteran pests.
Dipping in buprofezin had no appreciable effect on adult mortality, oviposition and development ofComperiella bifasciata (Howard), (Hymenoptera: Encyrtidae). When exposed to hosts treated with buprofezin, percentage mortality of adultEncyrtus infelix Embleton (Encyrtidae) was low; buprofezin had some detrimental effect on immature stages ofE. infelix when applied prior to parasitization, but not when introduced after parasitization. Buprofezin had a slight effect on the immature stages ofCryptochaetum iceryae Williston (Diptera: Cryptochaetidae), while fenoxycarb and pyriproxyfen had marked detrimental effects on parasitization and/or development of the parasitoid fly. None of the larvae ofRodolia cardinalis Mulsant (Coleoptera: Coccinellidae) developed into adults after application of buprofezin, fenoxycarb or pyriproxyfen. Buprofezin and chlorfluazuron completely prevented egg hatch ofChilocorus bipustulatus L. (Coleoptera: Coccinellidae). Buprofezin did not adversely affect egg hatch and larval development ofElatophilus hebraicus Pericart (Hemiptera: Anthocoridae); fenoxycarb or pyriproxyfen applied either before or after oviposition on pine needles caused total suppression of egg hatch.
Résumé
Les effects de quatre régulateurs de croissance d'insectes (buprofézine, fénoxycarbe, pyriproxyfène et chlorfluazuron) sur six ennemis naturels de cochenilles font l'objet, de cette étude, aux concentrations recommandées pour usage agricole.
L'immersion dans la buprofézine n'a pas d'effet, appréciable sur la mortalité, l'oviposition et le développement deComperiella bifasciata (Howard) (Hym.: Encyrtidae). La mortalité des adultes d'Encyrtus infelix Embleton (Encyrtidae) exposés à des, hôtes traités avec de la buprofézine est faible; la buprofézine produit un certain effect négatif sur les stades immatures d'E. infelix quand ce produit est appliqué avant le parasitisme mais n'a pas d'effet lorsque le produit est appliqué après. Ce régulateur de croissance n'a qu'un faible effet sur les stades immatures deCryptochaetum iceryae Williston (Dipt.: Cryptochaetidae), alors que le fénoxycarbe et le pyriproxyfène ont un effet négatif sur le parasitisme et/ou le développement de la mouche parasitoïde. Aucune larve deRodolia cardinalis Mulsant (Col.: Coccinellidae) n'atteint le, stade adulte après application de buprofézine, fénoxycarbe ou pyriproxyféne. La buprofézine et le chlorfluazuron empêchent totalement l'éclosion des œufs deChilocorus bipustulatus L. (Col.: Coccinellidae). La buprofézine n'a pas d'effet, négatif sur l'éclosion des œufs et le développement larvaire d'Elatophilus hebraicus Péricart (Hem.: Anthocoridae); par contre le fénoxycarbe et le pyriproxyfène appliqués, sur les aiguilles de pin avant ou après l'oviposition empêchent totalement l'éclosion des œufs chez cette espèce.
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Mendel, Z., Blumberg, D. & Ishaaya, I. Effects of some insect growth regulators on natural enemies of scale insects (Hom.: Coccoidea). Entomophaga 39, 199–209 (1994). https://doi.org/10.1007/BF02372358
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DOI: https://doi.org/10.1007/BF02372358