The Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae), is an internal primary pest of stored grains of great economic importance. Few insecticides registered for fumigation control for S. zeamais exist, which makes it necessary to search for more control alternatives. Thus, the objective of this work was to assess acute toxicity, sublethal effect, survival and behavioral response of the major components of essential oils, Thymol, Camphora, Terpineol, Canpheno, Eucalyptol, Limonene, β Pinene and Eugenol; and the mixtures of these components on S. zeamais. The results showed that the mixtures of the major components caused acute toxicity, reduced survival time and offspring production, in addition to altering the behavioral activity of S. zeamais. The mixture Camphor + Canphene presented a synergistic effect, with LC50 and LC90 of 2.77 and 20.34 µl/ml, respectively. The mixtures of the major components proved to be promising products for the control of S. zeamais.

The objective of this work was to evaluate the acute toxicity, sublethal effect and behavioral alteration of L. serricorne exposed to the major components of essential oils, thymol, camphor, terpineol, camphene, eucalyptol, limonene, βpinene and eugenol. The adults of L. serricorne , aged 5 days, not sexed, were submitted to acute toxicity by fumigation, used fumigation chambers, 200 ml glass containers with 20 insects, subsequently the sublethal effect, longevity and behavioral response. The results show that the major components and mixtures caused acute toxicity, reduced the survival time and production of offspring and altered the behavioral activity of L. serricorne. The major components eucalyptol and terpineol presented 65% mortality, in which the mixtures terpineol + eucalyptol and camphor + thymol presented 47 and 52% over adults of L. serricorne. The mixture between terpineol + limonene allowed only 4% ofadults to L. serricorneemerge. Behavioral activity was altered by the eucalyptol + eugenol mixture. The results showed that the major components and mixtures are promising for the preparation and production of new insecticides.

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