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Field tests on the efficacy of baits based onBacillus thuringiensis and chemical insecticides against the greasy cutwormAgrotis ypsilon Rdf. in Egypt

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Abstract

Field tests were conducted to determine the effectiveness of wheat-brain baits based onBacillus thuringiensis var.kurstaki HD-1 (dipel 2x) compared to the organophosphorous insecticide Hostathion against the greasy cutwormAgrotis ypsilon infestations on horse bean (Vicia fabae) cultivations. Significant larval reductions were observed in all treated plots after one application with a significant increase in the yield (1.45–1.60 folds) compared to the control plots. The yield was not obviously affected by varying the dose of dipel in the bait between 150–250 g/feddan. The addition of the adjuvant potassium carbonate to the dipel bait caused a significant larval reduction, 10 days after application and showed to be as efficient as baits based on Hostathion.

Zusammenfassung

Es wurden Freilandversuche zur Bestimmung der Wirksamkeit von Weizenkleie-Ködern aufBac. thuringiensis var.kurstaki-Basis (Dipel 2x) im Vergleich zu Ködern des Organophosphor-Insektizids Hostathion auf die Raupen der EuleAgrotis ypsilon inVicia fabae-Kulturen durchgeführt. Dabei wurden in allen behandelten Parzellen (nach einmaliger Behandlung) signifikante Larven-Reduktionen, verbunden mit Anstiegen der Ernte um das ca. 1,5fache verglichen mit Kontrolle erzielt. Die Erntemenge wurde durch Variation der Dipel-Dosis in den Ködern (zwischen 150 und 250 g/Feddan) nicht sichtbar verändert. Eine Zugabe von Kaliumkarbonat zu den Dipelködern bewirkte eine signifikante Verminderung der Raupenzahl 10 Tage nach Anwendung und zeigte sich damit als ebenso effizient wie die Hostathion-Köder.

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Authors and Affiliations

  1. Department of Pests and Plant Protection, National Research Centre, Dokki, Tahrir St., Cairo

    H. S. Salama, S. Moawed, R. Saleh & M. Ragaei

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  1. H. S. Salama
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  2. S. Moawed
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  3. R. Saleh
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  4. M. Ragaei
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Salama, H.S., Moawed, S., Saleh, R. et al. Field tests on the efficacy of baits based onBacillus thuringiensis and chemical insecticides against the greasy cutwormAgrotis ypsilon Rdf. in Egypt. Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 63, 33–36 (1990). https://doi.org/10.1007/BF01907589

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