| The effect of repellency and fumigant toxicity of encapsulated formulation of Artemisia sieberi Besse essential oil on Sitophilus oryzae (L). |
| Paper ID : 1146-3IICE (R2) |
| Authors: |
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Elham Shahinfar1, َAhmad Heidari *2, Sohrab Imani1, Ali Ahadiyat1, maryam negahban3 1Department of Plant Protection, Science and Research Branch, Islamic Azad University, Tehran, Iran 2Iranian Research Institute of Plant protection 3Department of pesticides, Iranian Research Institute of Plant Protection |
| Abstract: |
| Nowadays the increased pest resistance to chemical pesticides and the pesticides residues in food, together with the toxic effects of pesticides on mammals and the environment, necessitates the use of newer and safer alternatives for controlling insect pests. The use of encapsulation technology for pesticides formulation has led to increased efficiency and controlled release of these substances. In this study, two formulations containing Artemisia Sieberi Besse essential oil based on biodegradable polymers such as polyethylene glycol, starch and maltodextrin were prepared as powder that we call them, formulation 1 and 2. These formulations are different in the amount and type of polymers and surfactants. Also, these formulations are combined with a different rotation speed of the homogenizer. The essential oil used in this study was purchased from Barij Essence Co. Rice weevils were grown in pest control laboratory at the Iranian Research Institute of Plant Protection at 27 ± 1 ° C, 70 ± 5 % RH in darkness. After 4 generations, the adult insects of 1 to 3 days (in both sexes) were used for testing. The bioassay was done in 280 ml glass jar on laboratory conditions that mentioned above in four replications. In each replicate, 10 adult insects were used, and also water control was considered for each replicate. In this study, fumigant toxicity of these formulations was compared with the ordinary essential oil. The experiments were carried out on adult stage of rice weevil (Sitophilus Oryzae) at 27 ± 1 ° C, 70 ± 5 % RH and in total darkness condition. The results showed that the LC50 of the essential oil after 24 hours was 68.54 ppm, while the LC50 of formulations 1 and 2 were 57.55 and 23.94 ppm respectively, after 72 hours. The repellency of the essential oil at the concentration of 15 ppm over a period of 6 hours was 100%, and then began to decrease, while formulation 1, caused 100% repellency in first 24 hours and then reached 70% in 72 hours, but the formulation 2 maintained its repellency at 100% during 72 hours. Therefore, the encapsulation of plant essential oils as a safe pesticide with slow release and fumigant toxicity can be used in stock pest managements. |
| Keywords: |
| Sitophilus Oryzae, essential oil, encapsulation, Artemisia Sieberi, repellency, fumigant toxicity, |
| Status : Paper Accepted (Poster Presentation) |
