6-Pentyl-2H-pyran-2-one: A Potent Peach-Derived Kairomone for New Zealand Flower Thrips, Thrips obscuratus
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New Zealand flower thrips, Thrips obscuratus (Thysanoptera: Thripidae), are attracted to ripening fruits, especially peaches. Volatiles from unripe and ripe peach fruits were collected and analyzed by gas chromatography/mass spectrometry. Six lactones were found only in ripe peach volatiles: γ-heptalactone, γ-octalactone, γ-nonalactone, 6-pentyl-2H-pyran-2-one, γ-decalactone, and δ-decalactone. When these compounds were tested individually in field-trapping experiments, three of them (γ-octalactone, γ-nonalactone, and 6-pentyl-2H-pyran-2-one) attracted New Zealand flower thrips. In another field-trapping experiment, aimed at testing various combinations of the three active compounds, no synergistic effects were found among all combinations tested; no combination caught more thrips than 6-pentyl-2H-pyran-2-one, alone. A further field-trapping experiment was conducted to determine the dose (10, 100, and 500 mg) of 6-pentyl-2H-pyran-2-one that gave the greatest catch of T. obscuratus, while also comparing it against another attractant, ethyl nicotinate, for T. obscuratus. The greatest catches in traps baited with either attractant were at loadings of 500 mg. At both 10 and 500 mg, traps baited with 6-pentyl-2H-pyran-2-one caught more T. obscuratus than those baited with the same amounts of ethyl nicotinate. 6-Pentyl-2H-pyran-2-one is a potent attractant for New Zealand flower thrips and, therefore, could be used for monitoring and control of New Zealand flower thrips. Work is underway developing monitoring and control options utilizing 6-pentyl-2H-pyran-2-one for this important pest.
KeywordsThrips obscuratus Ripe peach Lactones 6-pentyl-2H-pyran-2-one Kairomone Thysanoptera Thripidae
This work was supported by the New Zealand Foundation for Research Science and Technology (CO6X0811, Integrated Pest Management in Horticulture) and Summerfruit New Zealand. We thank John Revell for helping with chemical analysis and Table 1. We thank Mr. Bruce Tweedy for allowing us to conduct experiments in his orchard.
- Cutler HG (1984) Biologically active natural products from fungi: templates for tomorrow’s pesticides. In bioregulators, chemistry and uses, Ory RL, Rittig FR, (eds) American Chemical Society: Washington, DC, pp. 153–170Google Scholar
- El-sayed AM (2013) The Pherobase: Database of Insect Pheromones and Semiochemicals. http://www.pherobase.com
- Mclaren GF (1992) Thrips on nectarines in the spring. Proceedings 45th NZ Plant Protection Conference: 111–115Google Scholar
- Mclaren GF (1995) Factors influencing the monitoring of New Zealand flower thrips Thrips obscuratus (Crawford). Proc Australia and New Zealand Thrips workshop: Methods Biology, Ecology and Management 25–27 July 1995, Gosford, Australia: 52–62Google Scholar
- Mclaren GF, Fraser JA (2000) Development of thresholds for insecticidal control of New Zealand flower thrips on nectarines in spring. NZ Plant Protection 53:194–199Google Scholar
- Mclaren GF and Fraser JA (2002) Diurnal activity of New Zealand flower thrips on stonefruit in spring and at harvest. Proceedings of the 7th International Symposium on Thysanoptera, pp. 269–271Google Scholar
- Norton SA (1984) Thrips pollination in the lowland forest of New Zealand. NZ J Ecol 7:157–164Google Scholar
- Sas Institute Inc (1998) Statview. SAS Institute Inc., Cary, North CarolinaGoogle Scholar
- Suckling DM, Shaw PW (1992) Conditions that favor mating disruption of Epiphyas postvittana (Lepidoptera: Tortricidae). Env Ent 21:949–956Google Scholar
- Teulon DAJ, Penman DR (1990) Host records for the New Zealand flower thrips (Thrips obscuratus (Crawford) Thysanoptera: Thripidae). NZ Entomologist 13:46–51Google Scholar
- Teulon DAJ, Penman DR, Ramakers PMJ (1993) Volatile chemicals for thrips (Thysanoptera: Thripidae) Host finding and applications for thrips pest management. J Econ Entomol 86:1405–1415Google Scholar