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Acute toxicity and mutual synergistic effect of six monoterpenoids on Spodoptera littoralis larvae was recorded. Out of the essential oils compounds tested for topical acute toxicity, the most potent were thymol and carvacrol, with LD90 values < 100 ìg per larva (weight 25 - 30 mg). In comparison for fumigant acute toxicity, the most potent were ã-terpinene, p-cymene and 1,8-cineole, with LD90 values < 100 ìg per cm3. Nine binary mixtures out of 15 tested couples showed the synergistic effect in topical application. The most significant synergism was found in p-cymene in the mixture with ã-terpinene or carvacrol. In the fumigant application, 9 binary mixtures showed a synergistic effect; 5 mixtures showed an additive effect, and one mixture showed an antagonistic effect. The most profound synergistic effect was found in ã - terpinene in the mixture with carvacrol and in p-cymene in the mixture with thymol or carvacrol.
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