LOOPLURE EFFICACY AND ELECTROPHYSIOLOG ICAL RESPONSES IN THREE PLUSIINAE 1 SPECIES

Source concentration differences of (Z)-7-dodecen-l-ol acetate, or looplure, were evaluated for field trapping efficiency and electro- physiological responses with male Pseudoplusia includens (Walker), Trichoplusia ni (Hubner) and Rachiplusia ou (Guenn6) (Lepidoptera: Noctuidae). Sticky traps baited with 1000 #g of the lure captured a significantly greater ( P < 0.05) number of male P. includens and 72. ni than any other concentration; R. ou males were caught at a greater rate in traps baited with 100 #.g of looplure, significantly more ( P < 0.05) than with 1000 #g, Electroantennogram (EAG) studies demonstrated that antennae of male P. includens have a lower response threshold to looplure than either T. ni or R. ou antennae, the latter demonstrating the highest significant threshold of response. No differences in the stimulus-response functions of the three species were detected.