The aim of the study was to check the effect of Carum carvi L. essential oil and L-carvone on the emigration, repellence and mortality of Sitophilus oryzae L. In the experiments with caraway essential oil, concentrations of 0.1%, 0.5% and 1% were used, and concentrations of 0.05, 0.1, 0.5 and 1% were used with L-carvone. We assessed whether, in what concentrations and after what exposure time the substances acted on S. oryzae as repellents and/or insecticides. The laboratory tests were carried out at 29 ± 1 °C with 60 ± 5% relative humidity (RH). The deterrence, mortality and abundance of insects were noted after 1, 2, 3, 4, 5, 24 and 48 h. For caraway essential oil and L-carvone, the highest repellency was not shown in the highest concentrations that were used in the tests but in the lower concentrations of 0.5% and 0.1%, respectively. In all used concentrations, caraway essential oil showed repellent effects on S. oryzae. The highest repellency (60–98%) was caused by 0.5% caraway essential oil after 1, 2, 3, 4 and 5 h of research and by 0.1% L-carvone (16–100%). The highest mortality of S. oryzae was caused by 0.5% caraway essential oil and 1% L-carvone. L-carvone at a concentration of 0.05% did not cause mortality in S. oryzae. In conclusion, the greatest repellent effects on S. oryzae were caused by lower doses of caraway essential oil and L-carvone. These compounds do not show the normal relationship described in the previous literature on warehouse pests, in which the repellency increased with increasing concentrations of the tested plant material.
Background: The rice weevil (Sitophilus oryzae) originates from subtropical and tropical areas of Asia and Africa, but it also appears on other continents, mostly as a result of trade in rice. It may occur in grain fields as well as in storage facilities, and cause allergenic reactions. The aim of this study was to identify the potential antigens in all developmental stages of S. oryzae, which may cause an allergic response in humans. Methods: Sera of 30 patients were tested for the presence of IgE antibodies to antigens from three life stages of the rice weevil. To identify protein fractions containing potential allergens, proteins collected from larvae, pupae, and adults separated by sex of S. oryzae were fractionated by SDS-PAGE. Then, they were probed with anti-human, anti-IgE monoclonal antibodies, fractionated by SDS-PAGE and detected by Western blotting. Results: In total, 26 protein fractions of males and 22 fractions of other life stages of S. oryzae (larvae, pupae, and females) positively reacted with the examined sera. Conclusions: The conducted study showed that S. oryzae may be a source of many antigens which may cause the potential allergic reactions in humans.
ObjectiveThe aim of the study was to check whether Carum carvi L. essential oil and L-carvone act on Sitophilus oryzae L. as repellents and/or insecticides, in what concentrations and after what time. ResultsCaraway essential oil and L-carvone the highest repellency showed not in the highest concentrations used in the tests (1%), but in lower concentrations, respectively 0.5% and 0.1%. Caraway essential oil in all used concentrations showed repellent effects on S. oryzae. The highest repellency (60-98%) caused caraway essential oil in concentration 0.5% after 1, 2, 3, 4 and 5 h of the research. The highest repellence of L-carvone (16-100%) resulted in concentration 0.1%. The highest mortality of S. oryzae caused 0.5% caraway essential oil.
Introduction and Objective.The study compares the effect of two concentrations (0.1% and 1%) of plant material on repelling two dangerous stored pests -Rhyzopertha dominica F. and Sitophilus granarius L. Both species were treated with the essential oils of Foeniculum vulgare Mill., Carum carvi L., Mentha pulegium L., and Cananga odorata (Lam.) Hook.f. & Thomson, as well as the chemicals contained in these oils: anethole, L-carvone, pulegone and thymoquinone. Materials and method. Laboratory tests were carried out at 29±1 °C with 60±5% relative humidity (RH). Repellence of insects were noted after 1, 2, 3, 4, 5, 24 and 48 h. Results. A lower dose of essential oils and some of the tested compounds caused a stronger repellence in the specified species of beetles. In the case of R. dominica, the concentration of 0.1% pulegone and L-carvone had the greatest repellent effect. Differences in the repellence of R. dominica were found between the concentrations of 0.1%-1% among all the tested substances in each time interval. This difference ranged from 5.0%-52.92%. All substances used in the tests had a strong repellent effect on S. granarius (30%-100%). There were differences in the repellency of S. granarius between 0.1%-1% concentration in most of the tested substances in each time interval, but they were not as large as for R. dominica. Conclusions. The most interesting results were obtained concerning the relationship: the lower tested substance concentration caused a much stronger repellent effect of R. dominica and S. granarius.
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