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EFFECTS OF RESIDUES OF CHITIN-SYNTHESIS INHIBITORS ON EGG HATCH AND SUBSEQUENT LARVAL ENTRY OF THE CODLING MOTH, CYDIA POMONELLA (LEPIDOPTERA: OLETHREUTIDAE)1

  • H. R. Moffitt (a1), K. D. Mantey (a1) and G. Tamaki (a1)

Abstract

In laboratory and field studies with the codling moth, Cydia pomonella (L.), TH 6043 and TH 6044, experimental benzoylphenyl urea chitin-synthesis inhibitors, were as effective as diflubenzuron in reducing egg hatch and subsequent larval entry when eggs were deposited on previously treated fruits or foliage. All three compounds exhibited extended residual activity, with significant reductions in egg hatch occurring over a 19-week period. TH 6045 exhibited little activity against codling moth. All compounds tested were relatively ineffective in reducing egg hatch or subsequent larval entry when they were applied topically to deposited eggs, except for the red ring stage of development which was slightly affected.

Lors de tests de laboratoire et de terrain portant sur le carpocapse de la pomme, Cydia pomonella (L.), les inhibiteurs expérimentaux de la synthèse de la chitine TH 6043 et TH 6044, composés du type benzoylphényl urée, se sont avérés aussi efficaces que le diflubenzuron à réduire l'éclosion et la pénétration subséquente des larves quand des oeufs furent déposés sur des fruits et du feuillage traités. Les trois composés ont révélé un activité résiduelle prolongée, des réductions significatives de l'éclosion des oeufs étant observées pendant 19 semaines. Le TH-6045 s'est avéré peu efficace chez le carpocapse. Tous les produits testés se sont montrés inefficaces à réduire l'éclosion des oeufs et la pénétration subséquente des larves lorsqu'appliqués localement sur des oeufs pondus, sauf au stade de développement appelé anneau rouge, lequel fut perturbé légèrement.

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References

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EFFECTS OF RESIDUES OF CHITIN-SYNTHESIS INHIBITORS ON EGG HATCH AND SUBSEQUENT LARVAL ENTRY OF THE CODLING MOTH, CYDIA POMONELLA (LEPIDOPTERA: OLETHREUTIDAE)1

  • H. R. Moffitt (a1), K. D. Mantey (a1) and G. Tamaki (a1)

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