INTERSPECIFIC RECOGNITION THROUGH ODORS BY APHIDS (STERNORRHYNCHA, APHIDIDAE) FEEDING ON WHEAT PLANTS

In olfactometric experiments a wingless adult of Sitobion avenae was a ttracted by odours of a wingless adult of Rhopalosiphum padi feeding o n a wheat plant. When the stimulus consisted of either a wingless R. p adi without plant material or a wheat plant that had previously been i nfested by a wingless R. padi, the response by S. avenae was not signi ficant, suggesting that recognition is due to volatiles produced by th e combination of an aphid and a plant.