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Grindelane diterpenoid acids from Grindelia humilis: Feeding deterrency of diterpene acids towards aphids |
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| Authors: | Allan F Rose Kenneth C Jones WF Haddon David L Dreyer |
| Institution: | U.S. Department of Agriculture, Science and Education Administration, Western Regional Research Center, Berkeley, CA 94710, U.S.A. |
| Abstract: | Two new labdane diterpene acids have been isolated from Grindelia humilis. The spectroscopic properties of the acids and their derivatives, as well as conversion to methyl 6-oxogrindelate, showed that they were the epimeric pair 6α-hydroxy- and 6β- hydroxygrindelic acid. A series of 11 diterpene acids were surveyed for their feeding deterrency towards the aphid Schizaphis graminum. The substances tested showed a wide range of activity. |
| Keywords: | Compositae diterpene acids 6α-hydroxygrindelic acid 6β-hydroxygrindelic acid structure determination Aphididae Homoptera insect feeding deterrents |
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