Fumigant Toxicity of Eucalyptus camaldulensis and Callistemon viminalis Essential Oils on Sitophilus granarius
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Abstract
In this research insecticidal effects of Eucalyptus camaldulensis Dehnh and Callistemon viminalis (Gaertn) essential oils were investigated against adults (1-3 days old) of Sitophilus granarius L. in 280 ml glass vials with or without wheat grains. The essential oils were obtained by hydrodistillation method, using a modified Clevenger type apparatus. Experiments were carried out at 27±1°C and 65±5% R.H. under dark conditions. Results of fumigant toxicity tests showed that the mortality was increased with increase in concentration and time. Lethal concentration of E. camaldulnsis and C. viminalis to 50% of adults (LC50) was estimated to be 18.22 and 9.73 µL/L air, respectively. Lethal time to kill 50% of adults (LT50) at concentrations 35.71, 32.14, 28.57 and 25 µL/L air were lasted 18.00, 17.08, 16.55, and 16.09 h for E. camaldulnsis oil and 15.67, 14.89, 14.51, and 14.04 h for C. viminalis, respectively. The most sensitive stage to the essential oils was egg of S. granarius and that decreased with Growth gradualist. The activity of essential oils decreased significantly in jars filled with wheat kernels. LC50values of E. camaldulnsis and C. viminalis to kill S. granarius adults were 647.32 µL/L air and 629.34 µL/L air, respectively; showing the low fumigant efficacy of the oil in the grain storage. The cause may be due to a considerable sorption of essential oil by wheat grains and insufficient permeability of the oil vapors into seed inter-space.
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