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Influence of Plant Allelochemicals on the Tobacco Hornworm and its Parasitoid, Cotesia Congregata

Pedro Barbosa, Paul Gross and John Kemper
Ecology
Vol. 72, No. 5 (Oct., 1991), pp. 1567-1575
Published by: Wiley on behalf of the Ecological Society of America
DOI: 10.2307/1940956
Stable URL: http://www.jstor.org/stable/1940956
Page Count: 9
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Influence of Plant Allelochemicals on the Tobacco Hornworm and its Parasitoid, Cotesia Congregata
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Abstract

Experiments were conducted to determine if three plant defenses affected the parasitoid Cotesia congregata in a fashion that would influence herbivore-parasitoid interactions. We evaluated the developmental rate, size, and survival of the parasitoid Cotesia congregata, when reared from Manduca sexta fed on diets containing either nicotine, rutin, or hordenine. These results were compared to the effects of the same three chemicals on unparasitized M. sexta. The influences of the three plant defenses differed. In general, however, the effects of these allelochemicals on the parasitoid paralleled those on the unparasitized hornworn. The one major exception was that concentrations of nicotine that had little or no effect on the hornworm caused significant mortality of parasitoids. Neither rutin nor hordenine had large or consistent negative effects, although rutin had a pronounced effect on both hornworm and parasitoid developmental times.

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