Infochemicals mediating the foraging behaviour of Aleochara bilineata Gyllenhal adults: sources of attractants |
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Authors: | Lucie Royer and Guy Boivin |
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Affiliation: | (1) Department of Natural Resource Sciences (Entomology), Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, PQ H9X 3V9, Canada;(2) Present address: Natural resources Canada, Canadian Forest Service, P.O. Box 960, University Drive, Corner Brook, NF A2H 6J3, Canada;(3) Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 Blvd. Gouin, St-Jean-sur-Richelieu, PQ J3B 3E6, Canada |
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Abstract: | Aleochara bilineata Gyll. (Coleoptera: Staphylinidae) adults feed on eggs and larvae of cabbage maggot, Delia radicum (L.) (Diptera: Anthomyiidae), and might be used to control this pest. We undertook tests in a Y-tube olfactometer to determine if infochemicals are involved in the food foraging behaviour of A. bilineata adults and to precisely determine the potential sources of stimuli. A. bilineata adults oriented toward the stimuli from both the food-plant of the prey (rutabaga: Brassica napus var. napobrassica (L.) Reichb.) and the prey-plant complex (rutabaga infested by cabbage maggot larvae), but adults significantly preferred the effluvia of infested to uninfested rutabaga in a choice test. The sources of infochemicals in the infested rutabaga were the cabbage maggot larvae themselves and their frass. However, in a choice test adults preferred the effluvia of the larvae to that of the damaged rutabaga from which those larvae were obtained. It is not expected that a generalist predator uses precise herbivore-derived signals in food foraging activity, but the preference of A. bilineata adults for the larval volatiles over frass volatiles may reflect the dependence of this species on dipteran pupae for reproduction. |
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Keywords: | Coleoptera Staphylinidae cabbage maggot Delia radicum Aleochara bilineata predator foraging behaviour infochemical kairomone frass integument host-plant complex |
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