Attempts have been made in recent years to reduce the use of synthetic pesticides and seek alternative and innovative methods for pest control. We conducted a study on the chemical composition of Eucalyptus occidentalis essential oil and investigated the fumigant, contact and repellent effects against Tribolium castaneum (Herbst) (Col: Tenebrionidae) and Rhyzopertha dominica (F.) (Col: Bostrichidae). The major components were τ-cadinol (17.20), 1,8-cineol (15.5%), α-cadinol (14%) and α-pinene (9.21%). The contact toxicity experiment showed that the oil was more toxic to R. dominica (LD50 value 0.82 μL/cm) than to T. castaneum (LD50 value 0.99 μL/cm) and showed the same fumigant toxicity for both insects according to the 95% confidence limit of LC50. The repellency against T. castaneum was more than for R. dominica and increased from 14 to 75% for R. dominica and 22 to 78% for T. castaneum after 2 h. These results suggest that E. occidentalis essential oil is a potential candidate for use as a natural repellent and insecticide for stored-product insect pests.
Species of the genus <em>Chirothrips</em> Haliday live on various species of grasses (family Poaceae). In this research, <em>Chirothrips</em> <em>hamatus</em> Trybom is reported for the first time in Iran as the seventh species recorded in this country for the genus so far. Most specimens of <em>C. hamatus</em> were collected on <em>Phragmites</em> sp. in Khuzestan Province (Iran). As for <em>Chirothrips</em> <em>atricorpus</em> Girault that has been previously reported in Iran, the second antennal segment in<em> C. hamatus</em> is symmetrical. The morphological differences of these two species are discussed and illustrated herein.
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