Abstract
In our screening program for new agrochemicals from Chinese medicinal herbs and local wild plants, MeOH/CHCl3 extract of the tubers of Boschniakia himalaica was found to possess strong feeding deterrent activity against the red flour beetle, Tribolium castaneum. From the MeOH/CHCl3 extract, three feeding deterrents were isolated by bioassay-guided fractionation. The constituent compounds were isolated and identified as 3β-acetoxyurs-12-en-28-oic acid (1), 3β-acetoxyurs-28,13-olide (2) and (+)-pinoresinol monoglucoside (3) based on high-resolution electron impact mass spectrometry and nuclear magnetic resonance. Compounds 1, 2 and 3 exhibited feeding deterrent activity against T. castaneumadults with ED50 values of 378, 940 and 609 ppm, respectively. Key words: Boschniakia himalaica, Tribolium castaneum, feeding deterrent.
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