Response of the predatorRhizophagus grandis to host plant derived chemicals inDendroctonus micans larval frass in wind tunnel experiments (Coleoptera: Rhizophagidae,Scolytidae) |
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Authors: | David Wainhouse Tristram Wyatt Alun Phillips David R Kelly Mehrdad Barghian Paul Beech-Garwood David Cross Rex S Howell |
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Institution: | (1) Forestry Commission Research Station, GU10 4LH Wrecclesham, Farnham, Surrey, United Kingdom;(2) Cleppa Park Field Research Station, University of Cardiff, CFI 3TB Cardiff, United Kingdom;(3) Department of Chemistry, University of Cardiff, CFI 3TB Cardiff, United Kingdom |
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Abstract: | Summary Adults of the predatory beetleRhizophagus grandis are strongly attracted to both adult and larval frass of its specific prey,Dendroctonus micans, in walking bioassays. Spruce bark and resin are relatively unattractive. Solvent extracts of larval frass that were attractive toR. grandis adults in a flight wind tunnel contained a mixture of monoterpenes of host plant origin. A synthetic mixture of these monoterpenes, (+)—-pinene, (–)—-pinene, -phellandrene,dl limonene and 3-carene, was responsible for 70–80% of the activity of the most attractive extract. We suggest that a blend of monoterpenes in frass acts as a kairomone forR. grandis but that attraction to monoterpenes is only the first of a sequence of behavioural responses that ensures successful host location and identification. |
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Keywords: | larval frass predator prey biological control kairomones Rhizophagus grandis Dendroctonus micans Coleoptera Rhizophagidae Scolytidae |
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