Abstract
Abstract The phytotoxicity of clerod-14-ene-3α,4β,13ξ-triol, obtained from Viguiera tucumanensis (Hook. et Arn.) Griseb, was examined in Petri dish bioassays. This clerodane inhibited both germination and root growth of Sorghum halapense and Chenopodium album , and also slightly inhibited Ipomoea purpurea. Crop species also showed inhibitory activity: the growth and germination of Avena sativa was strongly inhibited. Germination of Brassica napus was unaffected. The strongest plant growth inhibitory activity of the clerodane was on C. album , and has been expressed as the p I 50.
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