Effects of accumulate dead and alive insects in trap on the capture ofTribolium castaneum (herbst) |
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| Authors: | Prof Dr P Trematerra Dr F Fontana M Mancini |
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| Institution: | (1) Present address: Dipartimento di Scienze Aninali, Vegetali e dell'Ambiente, University of Molise, Via Cavour 50, I-86100 Campobasso, Italy |
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| Abstract: | In the trapping ofTribolium castaneum (Herbst), the activity of traps baited or not baited with aggregation pheromone 4,8-dimethyldecanal is influenced by the presence in the traps of accumulate specimens trapped. This fact has been observed both in trap containing alive or dead specimens. Interactions in the different substances produced by adults of Red Flour Beetle during their communication relationship are involved in this behaviour.The results obtained in the trials suggests that the presence of alive insects in traps is attractive for other free specimens, but under conditions of overcrowding quinone produced by them regulate population density by counteracting the effect of the aggregation pheromone, causing the insects to disperse or suppressing aggregation behaviour.The presence of dead insects in the traps, baited or not baited with pheromone, can be repellent for other free specimens ofT. castaneum, probably related to the presence of a residual alarm pheromone produced by the specimens before of death.With 10 figures and 3 tables |
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