A Y-tube olfactometer was used to measure the response of Neoseiulus fallacis Garmen (Acari: Phytoseiidae) to severed and intact hop, Humulus lupulus L. (Urticales: Cannabaceae) damaged by Tetranychus urticae Koch (Acari: Tetranychidae). The predator did not distinguish between severed and intact uninfested hop, indicating that artificial wounding alone does not elicit the production of attractive volatiles detectable to N. fallacis. Plants damaged by T. urticae produced predator-attracting volatiles; this effect was strongest in severed plants. The induction of attractive volatiles in response to T. urticae feeding damage in hop apparently depends upon a simultaneous triggering of a wound response or the reduction in tugor that accompanies severing the plant.
Species 1: Acari Phytoseiidae Neoseiulus fallacis
Species 2: Acari Tetranychidae Tetranychus urticae (twospotted spider mite)
Species 3: Urticales Cannabaceae Humulus lupulus (hop)
Keywords: herbivore-induced plant volatiles
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