Contrasting Behavioral and Electrophysiological Responses of and (Coleoptera: Curculionidae) to Volatiles Emitted from the Tree of Heaven, .

and (Coleoptera: Curculionidae) are host-specific pests of (Mill.) Swingle (Sapindales: Simaroubaceae), causing extensive damage to the host. There are no effective attractants available for pest management. The main aim of this study was to explore the role of host plant-derived volatiles in the behavioral response of both weevil species. In a field experiment, both weevil species showed positive response to phloem, and there was no preference for phloem associated with healthy or injured trees. Significantly more adults responded to the olfactory treatments compared to . In a large-arena experiment, both males and females of significantly preferred phloem from the tree trunk while adults of responded in significantly greater numbers to tree limbs than to any other parts of host. Females and males of responded positively to all parts of host tested in the Y-tube bioassay, while adults were only attracted by the phloem from healthy and injured trees. There were dissimilar electroantennographic responses to compounds such as 1-hexanol and (1)-(-)--pinene between the two weevil species. This study represents the first report documenting behavioral and electrophysiological responses of and to volatiles from various parts of and findings may aid efforts to develop attractants.