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Residual toxicity and repellency of essential oils to stored-product insects

, : Residual toxicity and repellency of essential oils to stored-product insects. Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 102(4): 429-434

Residual toxicity and repellency of essential oils of Pimpinella anisum L., Eucalyptus camaldulensis Dehn., Thymbra spicata L. var. spicata and Satureja thymbra L. was investigated. Only essential oil of P. anisum showed high residual toxicity to Tribolium confusum du Val adults causing a mortality over 95% after a 5 days' exposure. All essential oils repelled Sitophilus oryzae (L.) adults in food preference tests. P. anisum was the most repellent one as only 0-7.2% of the rest insects preferred the treated food. It was followed by E. camaldulensis, T. spicata var. spicata and S. thymbra in which 5.2-17.4% of the test insects settled in the treated food. In area preference tests with T. confusum adults, repellencies over or about 50% were retained for 2 weeks with the essential oils other than E. camaldulensis, in the latter a 50% repellency lasted 4 weeks. All essential oils gave repellencies failing into the range of promising repellents, that is, presumably, a 40.1-60% repellency as an overall average of an 8 weeks exposure.


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