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Effects of insect growth regulators with juvenile hormone activity againstCallosobruchus maculatus (F.) (Coleoptera: Bruchidae)

  • G. E. S. Abo El-Ghar
Article

Abstract

Five insect growth regulators, CGA-29170, CGA-45128, MV-678, RO-20458, and fenoxycarb, that exhibit juvenile hormone activity were evaluated for biological and residual activity against the southern cowpea weevil,Callosobruchus maculatus (F.). The compounds were mixed with cowpea seeds at concentrations of 10, 25, 50, and 100 mg/kg, and the residual activity was evaluated at 2-week to 9-months posttreatment intervals. Most JHA-treatments showed high initial activity at the 2-week interval resulting in a significantly lower oviposition rate and showing a short residual life in this respect. CGA-45128, however, at all concentrations tested did not significantly affect oviposition at 2-week to 4-month posttreatment intervals, where was more active and caused high depression in oviposition at 6-month interval. The juvenoids had an inductive effect on the percent egg hatch at various intervals, especially CGA-29170 and CGA-45128 treatments extinding over a period of 9 months. At the lower concentration of 10mg/kg, CGA-45128 was highly effective as F1-progeny suppressant ofC. maculatus at 2-week posttreatment interval extending over 9 months. MV-678, CGA-29170, and fenoxycarb applied at 50, 50, and 25 mg/kg, respectively, showed similar activity, however, the residual activity of the latter decreased after 4 months. RO-20458, however, showed high initial activity at these concentrations. Adult emergence in all treatments was significantly suppressed, where did not exceed 29.5% at the lower concentrations of 10 and/or 25 mg/kg at 9-month posttreatment interval.

Keywords

Insect Growth Regulator Cowpea Seed Fenoxycarb Posttreatment Interval High Initial Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Fünf mit Juvenilhormon-Aktivität versehene Insektenwachstums-Regulatoren (JHA): CGA-29170, CGA-45128, MV-678, RO-20458 sowie Fenoxycarb, wurden auf ihre biologische und residuale Aktivität gegenüber dem SamenkäferCallosobruchus maculatus untersucht. Die Substanzen wurden mit Erbsensamen in Konzentrationen von 10, 25, 50 und 100 mg/kg gemischt, und die residuale Aktivität in 2-Wochen- bis 9-Monats-Intervallen ermittelt. Die meisten JHA-Behandlungen zeigten eine hohe Anfangs-Aktivität, die sich in signifikant niedrigerer Eiablage und kürzerer Lebensdauer ausdrückte. CGA-45128 jedoch ließ innerhalb von 2 Wochen bis 4 Monaten bei allen Konzentrationen keinen signifikanten Einfluß auf die Eiablage erkennen, wohl aber nach 6 Monaten. Die Juvenoide hatten eine induktive Wirkung auf die Eischlüpfquote, vor allem CGA-29170 und CGA-45128 9 Monate nach Behandlung. Bei niedrigerer Konzentration von 10 mg/kg war CGA-45128 hochwirksam als Depressor der F1-Nachkommen vonC. maculatus nach 2 Wochen bis 9 Monaten. MV-678, CGA-29170 und Fenoxycarb, mit 50, 50 und 25 mg/kg angewandt, zeigten änliche Aktivitäten, doch verringerte sich die residuale Aktivität des letztgenannten Wirkstoffs schon nach 4 Monaten wesentlich. RO-20458 zeigte bei diesen Konzentrationen hohe Anfangs-Aktivität. Das Adultenschlüpfen wurde nach allen Behandlungen signifikant verringert und erreichte bei 10 und/oder 25 mg/kg nach 9 Monaten maximal 29,5% des Normalen.

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Copyright information

© Verlag Paul Parey 1992

Authors and Affiliations

  • G. E. S. Abo El-Ghar
    • 1
  1. 1.Department of Plant Protection, Faculty of AgricultureMinufiya UniversityShibin El-KomEgypt

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