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Four essential oils of  Curcuma longa, Illicium verum, Ocimum tenuiflorum  and  Foeniculum vulgare  were selected for insecticidal activity against the tobacco cutworm,  Spodoptera litura  (Fabricius) (Lepidoptera, Noctuidae) by using leaf dipping bioassay. Toxicity on second instar larvae was assessed after 24 hours of exposure. The result revealed that all the four essential oils effectively killed the larvae and showed high antifeedant activity. The highest killing amount for controlling the larvae and highest anti-feedant effect were observed in the essential oils of  Curcuma longa  and  Illicium verum  0.75% concentration causing 100% mortality after 24 hours. These oils also presented the highest anti-feedant effect for controlling the larvae at 0.25% concentration. It seems that, plant essential oils derived from  Curcuma longa  and  Illicium verum  have an ability to be used as herbicide for controlling  Spodoptera litura.

iop conference series. earth and environmental science

Effectiveness of plant essential oils derived from Curcuma longa, Illicium verum, Ocimum tenuiflorum, and Foeniculum vulgare for controlling common cutworm (Spodoptera litura)