2-Methoxyphenols, 1,2-Dimethoxybenzenes, and 1,3-Benzodioxoles as Attractants for the Northern Corn Root worm (Coleoptera: Chrysomelidae)1

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Abstract
Selected 2-methoxyphenols,1,2-dimethoxybenzenes, and 1,3-benzodioxoles were tested in the field as attractants for the northern corn root worm (NCR), Diabrotica barberi Smith & Lawrence, in comparison with eugenol (4-allyl-2-methoxyphenol), isoeugenol (2-methoxy-4-(1-propenyl)phenol), and 2-methoxy-4-propylphenol. Of these, 4-ethyl-2-methoxyphenol and 4-butyl-2-methoxyphenol showed relatively high degrees of attraction. Structural comparisons indicated that in a eugenol-type structure (i.e., a 1,2,4-trisubstituted benzene) a 4-alkyl substituent and a 1-hydroxyl group are necessary features for attraction of the NCR. The optimal 4-alkyl chain length is a three-carbon chain.