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This study was conducted to determine the fumigant effects of the essential oil from Ruta graveolens L. flowers and leaves against Khapra beetle [Trogoderma granarium (Coleoptera: Dermestidae)] larvae and adults. Cultivation of stock cultures and experiments were carried out under 35±2 °C temperature and 16 hours light 8 hours dark photoperiod conditions in 3 replicates with in each repetition. In the studies, 10 pieces of wheat and 10 pieces of T. granarium larvae or adults were put in 10 ml glass tubes. Different 5 concentrations (1.5, 3.5, 6.5, 9.2 and 12.0 µl/ml) of R. graveolens essential oil were used 10 µl for each tube. Results evaluated by considering the number of live and dead individuals at the end of 24, 48 and 72 hours. According to the results obtained from fumigant effect tests against T. granarium larvae and adults; it has been determined that the toxicity varies depending on the application dose and the application time of the plant essential oil and it has an effect of 100% on the larvae of the pest at the end of the 72 hour, and the maximum effect in adult individuals is 28.57% at a concentration of 3.5 µl/ml. [ABSTRACT FROM AUTHOR]

Canola is one of the most important oil and alternation plants in our country. Also, it-'s production has increased over time and it still keep having a large production, especially in Thrace region in Turkey. Canola also has many pests as well as other crops. With this study, determination of the presence of pest insect species in the canola production areas in the Çorlu province of Tekirdağ and also developing a base of information for the future studies, was aimed. In 2017, 21 species and in 2018, 17 species were identified in the research. Psylliodes chrysocephala (L.) (Coleoptera: Chrysomelidae) is the highest rate of occurrence in both years. Also Plutella xylostella (L.) (Lepidoptera: Plutellidae), Ceutorhynchus picitarsis (G.) (Coleoptera: Cuculionidae), Dolycoris baccarum (L.) (Hemiptera: Pentatomidae) and Brevicoryne brassicae (L.) (Hemiptera: Aphidiidae) are most common ones. P. xylostella is in April, B. brassicae in June, in May 2017 D. baccarum and in 2018 P. chrysocephala were determined as common species. [ABSTRACT FROM AUTHOR]

In this study, fumigant effects were investigated of Laurel (Laurus nobilis L.) and Zahter (Thymbra spicata L.) essential oils in different concentrations on Rhyzopertha dominica (Coleoptera: Bostrichidae) and Oryzaephilus surinamensis (Coleoptera: Silvanidae). For each insect species separately for R. dominica and O. surinamensis species, 12 groups were formed in each group as 20 insects. These groups were the control group, solvent control group (150 µl L-1) include five different doses for L. nobilis. essential oils group (12.5, 25, 50, 100, 150 µl L-1) include five different doses for T. spicata essential oils group (12.5, 25, 50, 100, 150 µl L-1). In the experimental setup for R. dominica, familiar results were obtained from L. nobilis with negative group, and solvent solution group, but mortality increased depend on increase in time and concentration. At the end of 24 hours, 100% fumigant toxicity was recorded in 100 µl L-1 solution. Similar results were obtained with the T. spicata application for the same insect species, with the highest concentration showing 100% fumigant toxicity after 24 hours. Similar results were recorded for O. surinamensis another storage pest, using the same plant essential oils and concentrations. As a result of the data obtained from the plant essential oil and its components, for R. dominica and O. surinamensis can be used instead of synthetic pesticides. [ABSTRACT FROM AUTHOR]