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Effect of a Natural Insecticide from Nicotiana gossei on the Whitefly Parasitoid Encarsia formosa (Hymenoptera: Aphelinidae)

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The collateral effects of a biorational compound from Nicotiana gossei Domain on the parasitoid Encarsia formosa Gahan were determined in laboratory and greenhouse tests and compared with the effects of spraying with M-Pede or Margosan-O. Fewer parasitized whitef1y pupae were killed by spraying with N. gossei extract or Margosan-O than spraying with M-Pede. More E. formosa wasps were killed by spraying with M-Pede than by spraying with N. gossei extract or Margosan-O and when confined to treated leaf surfaces 1 h after spraying. At 1.5 and 3 h after spraying, both N. gossei extract and M-Pede killed more wasps than when spraying with Margosan-O. When wasps were released into greenhouses 3 h after spraying, fewer whiteflies were parasitized on tomato leaflets treated with biorationals than on leaflets treated with water. However, at 24 h after spraying tomato leaflets, parasitization was significantly higher on those treated with N. gossei extract and Margosan-O. Fewer wasps were found on leaflets treated with M-Pede. A1thoughthe 3 biorational insecticides caused mortality of E. formosa, the N. gossei extract was less detrimental than M-Pede to the viability of E. Formosa.. N. gossei extract could be used successfully with E. formosa in integrated pest management programs

Document Type: Research Article

Publication date: December 1, 1995

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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