METHOD: Test Diet METHOD NARR: Excised leaflets of ber were used in a choice test for female apterous aphids. The number of aphids present on the abaxial surface of the leaflets was counted at 30, 180 and 330 minutes after releasones carrying type A and B trichomes were least preferred. AUTHOR EXPLANATION: The observed behaviour was probably influenced by volatile compounds present in type B trichome exudate.