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Antipredator Defense of Biological Control Agent Oxyops vitiosa Is Mediated by Plant Volatiles Sequestered from the Host Plant Melaleuca quinquenervia

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Abstract

The weevil Oxyops vitiosa is an Australian species imported to Florida, USA, for the biological control of the invasive weed species Melaleuca quinquenervia. Larvae of this species feed on leaves of their host and produce a shiny orange secretion that covers the integument. When this secretion is applied at physiological concentrations to dog food bait, fire ant consumption and visitation are significantly reduced. Gas chromatographic analysis indicates that the larval secretion qualitatively and quantitatively resembles the terpenoid composition of the host foliage. When the combination of 10 major terpenoids from the O. vitiosa secretion was applied to dog food bait, fire ant consumption and visitation were reduced. When these 10 terpenoids were tested individually, the sesquiterpene viridiflorol was the most active component in decreasing fire ant consumption. Fire ant visitation was initially (15 min after initiation of the study) decreased for dog food bait treated with viridiflorol and the monoterpenes 1,8-cineole and α-terpineol. Fire ants continued to avoid the bait treated with viridiflorol at 18 μg/mg dog food for up to 6 hr after the initiation of the experiment. Moreover, ants avoided bait treated with 1.8 μg/mg for up to 3 hr. The concentrations of viridiflorol, 1,8-cineole, and α-terpineol in larval washes were about twice that of the host foliage, suggesting that the larvae sequester these plant-derived compounds for defense against generalist predators.

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Authors and Affiliations

  1. USDA/ARS Invasive Plant Research Laboratory and University of Florida, 3205 College Ave., Ft. Lauderdale, Florida, 33314

    G. S. Wheeler

  2. Department of Occupational Therapy, Nova Southeastern University, Ft. Lauderdale, Florida, 33314

    L. M. Massey

  3. New South Wales Agriculture, Wollongbar Agricultural Institute, Wollongbar, NSW, 2477, Australia

    I. A. Southwell

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  1. G. S. Wheeler
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  2. L. M. Massey
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  3. I. A. Southwell
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Correspondence to G. S. Wheeler.

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Wheeler, G.S., Massey, L.M. & Southwell, I.A. Antipredator Defense of Biological Control Agent Oxyops vitiosa Is Mediated by Plant Volatiles Sequestered from the Host Plant Melaleuca quinquenervia. J Chem Ecol 28, 297–315 (2002). https://doi.org/10.1023/A:1017982007812

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