Dried fruits of star anise, Illicium verum, were extracted with hexane and methanol to obtain non-polar and polar fractions, respectively. The insecticidal activity of non-polar crude extracts was tested against eggs, larvae and adults of Tribolium castaneum and adult Sitophilus zeamais. T. castaneum eggs were all killed at 0.01 g ml-1 extract. The adults were more susceptible than the larvae, and younger larvae more susceptible than older ones. S. zeamais adults were twice as tolerant to the non-polar extract as T. castaneum adults. High mortality (70%) of T. castaneum adults occurred in rice treated with the non-polar extract after 21 days' exposure. The effects of polar extracts on the two species of insects were not significant. Adults were allowed to lay eggs in extract-treated rice medium for two days and were then removed. F1 progeny production was monitored. Non-polar extracts completely suppressed F1 adult emergence in both species, while polar extracts only caused a significant reduction in F1 adult emergence. The potential of non-polar star anise extracts as a grain protectant, particularly as an ovicide, is discussed. © 1995.
CITATION STYLE
Ho, S. H., Ma, Y., Goh, P. M., & Sim, K. Y. (1995). Star anise, Illicium verum Hook f. as a potential grain protectant against Tribolium castaneum (Herbst) and Sitophilus zeamais Motsch. Postharvest Biology and Technology, 6(3–4), 341–347. https://doi.org/10.1016/0925-5214(95)00015-X
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