The presence of an alarm pheromone was demonstrated in the deutonymphal stage of the oribatid mite, Nothruspalustris (C. L. Koch). The active principle was identified as 3,7-dimethyl-(E)-2,6-octadienal, geranial, and was shown to be active at doses of 10-100 ng. This is the first such pheromone identified in oribatid mites.
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