Abstract
The antifeedant of barnyard grass (var. oryzicola) against N. lugens was isolated and characterized as trans-aconitic acid. This acid was detected in barnyard grass but not in rice plant. Trans-aconitic acid, neutralized to pH 7 with calcium hydroxide, showed potent inhibitory activity for feeding of N. lugens at concentrations of 0.25% and 0.5% while the cis-isomer showed much less inhibitory activity.
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