Nowadays, extensive research is being done on plant compounds to find safer and low-risk alternative for controlling pests. In this study, two formulations, containing Artemisia sieberi Besser essential oil based on biodegradable polymers were prepared as powders to con
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Nowadays, extensive research is being done on plant compounds to find safer and low-risk alternative for controlling pests. In this study, two formulations, containing Artemisia sieberi Besser essential oil based on biodegradable polymers were prepared as powders to control the rice weevil, Sitophilus oryzae. These formulations were different in the amounts and types of polymers and surfactants. The repellency effect of these formulations and A. sieberi oil was compared at two sublethal concentrations of 5 and 10 µI/I air. The surface morphology of powders was also studied by the transmission electron microscope (TEM). The average size of particles was measured about 41.19 and 37.86 nm for formulations 1 and 2, respectively, using the software Image j. The result shows that, after 96 hours, the percentage of repellency in essential oil, formulation 1 and formulation 2 for 5 ppm concentration is calculated 45%, 65% and 70% respectively, and for 10 ppm concentration it is calculated 55%, 70% and 75% respectively. Also, the repellency effects of normal essential oil and the formulations prepared at different times showed that with increasing the concentration of all compounds, the amount of repellency increases. Based on the results, to maintain the biological activity of essential oils and prevent the evaporation of their constituents, it is necessary to formulate essential oils, therefore encapsulation of plant essential oils as a safe pesticide with gradual release and maintenance of fumigant toxicity can be considered in integrated pest management.
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