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Female-Produced Sex Pheromone of Tetrastichus planipennisi, a Parasitoid Introduced for Biological Control of the Invasive Emerald Ash Borer, Agrilus planipennis

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Abstract

The Asian eulophid wasp Tetrastichus planipennisi is being released in North America as a biocontrol agent for the emerald ash borer (Agrilus planipennis), a very destructive invasive buprestid beetle that is devastating ash trees (Fraxinus spp.). We identified, synthesized, and tested a female-produced sex pheromone for the wasp. The key component eliciting behavioral responses from male wasps in flight tunnel bioassays was identified as (6S,10S)-(2E,4E,8E)-4,6,8,10-tetramethyltrideca-2,4,8-triene. Female specificity was demonstrated by gas chromatographic (GC) comparison of male and female volatile emissions and whole body extracts. The identification was aided by coupled gas chromatography/mass spectrometry analysis, microchemical reactions, NMR, GC analyses with a chiral stationary phase column, and matching GC retention times and mass spectra with those of synthetic standards. The tetramethyl-triene hydrocarbon was synthesized as a mixture of two enantiomeric pairs of diastereomers, and as the pure insect-produced stereoisomer. In flight-tunnel bioassays, males responded to both the natural pheromone and the chiral synthetic material by upwind flight and landing on the source. In contrast, the mixture of four stereoisomers was not attractive, indicating that one or more of the “unnatural” stereoisomers antagonized attraction. Field trials, using yellow pan traps baited with natural pheromone, captured significantly more male wasps than control traps over a four week trial. The identified pheromone could increase the efficiency and specificity of the current detection methods for Tetrastichus planipennisi and aid in the determination of parasitoid establishment at release sites.

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Acknowledgements

We thank Karl Vermillion for the NMR analysis (USDA/ARS/NCAUR, Peoria, IL). We thank Robert Bartelt (USDA/ARS/NCAUR, Peoria, IL, retired) for very helpful suggestions towards the structure determination. We thank Miriam Cooperband (USDA/APHIS/PPQ, Otis Laboratory, MA) for the statistical analysis. We are grateful for financial support from the U.S. Department of Agriculture, Forest Service, and Animal & Plant Health Inspective Service (APHIS).

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Correspondence to Allard A. Cossé.

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This article reports the results of research only. Mention of a proprietary product does not constitute an endorsement or a recommendation by the U.S. Department of Agriculture (USDA) for its use. This research was supported [in part] by the intramural research program of the USDA Agricultural Research Service and the USDA Animal and Plant Health Inspection Service, Plant Protection and Quarantine. USDA is an equal opportunity provider and employer.

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Cossé, A.A., Zilkowski, B.W., Zou, Y. et al. Female-Produced Sex Pheromone of Tetrastichus planipennisi, a Parasitoid Introduced for Biological Control of the Invasive Emerald Ash Borer, Agrilus planipennis. J Chem Ecol 46, 508–519 (2020). https://doi.org/10.1007/s10886-020-01188-0

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