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Ovicidal Effects of Certain Pesticides on the Two Spotted Spider Mite, Tetranychus urticae and the Predacious Mite, Amblyseius gossipi (Acari: Tetranychidae: Phytoseiidae)

  • E. M. El-Banhawy
  • A. S. Reda
Research Article

Abstract

Different ages of the two spotted spider mite Tetranychus urticae Koch and the predacious mite Amblyseius gossipi El-Badry eggs were exposed to selected concentrations of Cypermethrin (500 ppm), flucythrinate (200 ppm), cyfluthrin (100 ppm), fenvalerate (200 ppm), Pyridaphenthion (25 ppm), dicofol (250 ppm), avermectin (10 ppm), and dimilin (50 ppm). Generally, the synthetic pyrethroids were effective on eggs especially those of A. gossipi. Dicofol was rather toxic to T. urticae eggs, while avermectin was only effective on older eggs of both species. Eggs treated with different pesticides at late stages took longer to hatch, particularly in the case of A. gossipi.

Résumé

Des oeufs de different âges de deux mites rouges tachêtées Tetranychus urticae Koch et de la mite repace Amblyseius gossipi El Badry fûrent exposées àdes concentrations variées de Cypermethrin (500 ppm), flucythrinate (200 ppm), cyfluthrin (100 ppm), fenvalerate (200 ppm), Pyridaphenthion (25 ppm), dicofol (250 ppm), avermectin (10 ppm) et dimilin (50 ppm). En géneral les pyréthres synthètiques etaient plus efficace sur les oeufs du A. gossipi. Dicofol était toxique sur les oeufs du T. urticae pendant que l’avermectin fût efficace sur les oeufs agés de deux espèces. Dans le case de A. gossipi les oeufs traités avec des pesticides differents ont pris plus de temps pour éclore.

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Copyright information

© ICIPE 1988

Authors and Affiliations

  • E. M. El-Banhawy
    • 1
  • A. S. Reda
    • 1
  1. 1.Plant Protection LaboratoryNational Research CentreDokki, CairoEgypt

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