Insect attraction to synthetic herbivore‐induced plant volatile‐treated field crops |
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| Authors: | Marja Simpson Geoff M. Gurr Aaron T. Simmons Steve D. Wratten David G. James Gary Leeson Helen I. Nicol |
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| Affiliation: | 1. Faculty of Science, School of Agricultural & Wine Sciences, EH Graham Centre for Agricultural Innovation (Industry & Investment NSW and Charles Sturt University), Charles Sturt University, Orange, Leeds Parade, PO Box 883, NSW 2800, Australia;2. National Centre for Advanced Bio‐Protection Technologies, Lincoln University, PO Box 84 Lincoln 7647, New Zealand;3. Irrigated Agriculture Research and Extension Centre, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350, U.S.A.;4. Organic Crop Protectants, 42 Halloran St, Lilyfield, NSW 2040, Australia |
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| Abstract: | - 1 Plants produce natural enemy‐attracting semiochemicals known as herbivore‐induced plant volatiles (HIPV) in response to herbivore damage. Deployment of synthetic HIPV in crops could enhance the biological control of pests. To test this, six HIPV [methyl salicylate (MeSA), methyl anthranilate (MeA), methyl jasmonate (MeJA), benzaldehyde (Be), cis‐3‐hexenyl acetate (HA), cis‐hexen‐1‐ol (He)] in three concentrations (0.5%, 1.0% and 2.0% v/v) mixed with a vegetable oil adjuvant, Synertrol® (Organic Crop Protectants Pty Ltd, Australia), were sprayed onto winegrape, broccoli and sweet corn plants.
- 2 The relative abundance of insects within treated plots was assessed with non‐attracting, transparent sticky traps at varying time intervals up to 22 days after spraying.
- 3 In the vineyard experiment, Trichogrammatidae responded to Be and MeA (0.5%) and Be (1.0%); Encyrtidae and Bethylidae responded to MeA (1.0%); Scelionidae responded to all compounds at 1.0% and 2.0%; and predatory insects responded to MeA. In sweet corn, parasitoids as a group and Encyrtidae responded to MeA (0.5%); Braconidae responded to all compounds at 0.5% and Synertrol‐only; thrips responded to all compounds at 0.5% and 1.0%; while all parasitoids responded to all compounds at 0.5% and 1.0% and Synertrol‐only. In broccoli, parasitoids as a group and Scelionidae responded to Be, HA, He and Synertrol‐only; Trichogrammatidae responded to Be (0.5%), He (0.5% and 1.0%), MeJA (1.0%) and MeSA (0.5%); and thrips responded to all compounds at to 0.5% and 1.0%.
- 4 Significant attraction of insects occurred up to 6 days after the HIPV application, suggesting that plants may have been induced to produce endogenous volatiles that attracted insects over an extended period.
- 5 The results obtained are discussed in relation to the potential utility of synthetic HIPV to enhance the biological control of pests.
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| Keywords: | Biological control broccoli grapevine HIPV induced defences parasitoids sweetcorn |
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