Behavioral and electrophysiological responses of the soybean beetle, Anomala rufocuprea Motschulsky(Coleoptera : Scarabaeidae) to methyl anthranilate and its related compounds

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Methyl anthranilate and 15 related compounds were evaluated for their attractiveness to, and electroantennogram (EAG) activity in the adult soybean beetle, Anomala rufocuprea. When combined with the female sex pheromone, six methyl benzoate derivatives, i.e. methyl anthranilate, methyl m-aminobenzoate, methyl benzoate, methyl salicylate, methyl o-toluate and methyl o-anisate, exhibited significantly higher attractiveness than a single application of the sex pheromone alone, with methyl anthranilate exhibiting the highest activity. EAG responses of the male antennae varied between the compounds in the amplitude range of 0.07-0.28 mV, all of which were much lower than the response to the female sex pheromone. The relationship between EAG amplitude and chemical structure was not clear, but a positive correlation between the EAG responses and volatility was shown (r=0.903). Methyl anthranilate, the most attractive compound tested, gave an average amplitude level in the EAG : 0.14 mV. For the tested compounds, EAG responses did not correlate with attractiveness for the adult A. rufocuprea.