Abstract: A comparative study on the antennal sensilla of various forms of Myzus persicae is undertaken. Scanning electron microscopy revealed four kinds of antennal sensilla, campaniform sensillum, trichoid sensillum, primary and secondary rhinarium. A major difference between various forms of M. persicae lies in the abundance of secondary rhinaria. Male, gynopara and alate virginopara possess secondary rhinaria, ovipara, fundatrix and apterous virginopara have none. Nevertheless, male aphids have more numbers of secondary rhinaria than gynoparae and alate virginoparae, and the sensilla are found not only on the 3rd antennal segment, but also on the 4th and 5th segments of males. The role of antennal sensilla in chemical ecology of peach aphid and the differences between various forms of peach aphid in correlation to migration, host selecting and mating behavior are discussed, sexual dimorphism in the antennae of M. persicae is also discussed.

Key words: Myzus persicae, antennal sensilla, morphology, scanning electron microscopy