Investigation of Insect Repellent Activity of Cyclocolorenone Obtained from the Red Alga Laurencia intricata

Three known secondary metabolites were isolated from the organic extract of Their structures were identified by NMR and MS experiments and comparison with the literature data. An aromadendrane sesquiterpene, (+)-cyclocolorenone showed strong repellent activity against the maize weevil Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae) adults insecticides, pyrethrins, with a ED50 value of 2.0 cyclocolorenone. The results suggest that the red alga which can be used as potential biocontrol

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