| Effect of magnetic field on effectiveness of the acaricide spirodiclofen in controlling the population of Tetranychus urticae (Acari: Tetranychidae) under semi-field conditions on Phaseolus vulgaris |
| Paper ID : 1005-3IICE (R1) |
| Authors: |
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Behnam Nezhadakbarimahani *1, Aurang Kavousi2, Jaefar Nikbakht3, Mohammad Hossein Rasoulifard4 1Plant protection, Agriculture, Zanjan University, Zanjan, Iran 2Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, Iran 3Water Engineering Department, Faculty of Agriculture, University of Zanjan, Iran 4Department of Chemistry, Faculty of Sciences, Zanjan University, Zanjan, Iran |
| Abstract: |
| The Two spotted spider mite, Tetranychus urticae Koch is a cosmopolitan polyphagous pest which its chemical control is confronting a challenge of rising ability of the mites in developing resistance to pesticides. In addition to being a resistance management method to pesticides, applying reduced doses has other advantages such as reduction in environment pollutions and lowering the control costs, as well. According to the literature review, flowing the water used for pesticide applications through a magnetic field can improve the pesticides efficiency. In this study the acaricidal activity of spirodiclofen treated with a magnetic field evaluated against the pest on Phaseolus vulgaris cv. Naz. Treatments included suspensions made from distilled water and well water after flowing five times at a moderate speed through a constant magnetic field of 0.42 Tesla. Furthermore, two additional treatments were made by magnetizing the suspension preparations. In control treatments both distilled and well waters were used without using magnetic field treatment. A number of 15 female adults carefully were transferred to each plant and the acaricide applied twice at 7 and 14 days after the mite’s infestation at the LC50 dose of 3.1 mg(AI)/liter. The motile forms were counted in situ, right before the sprays and days 7, 14 and 21. The treatments efficiencies were calculated by using Henderson-Tilton formula. As an overall conclusion, except in one test (flowing the well water through the magnetic field) in which its efficiency after two pesticide applications between day 7 and 21 was negative (approximately -11 %), in the rest of experiments magnetic field could enhance the efficiency of the studied acaricide. The highest values were recorded for two treatments including magnetizing the mixture of well water and acaricide treatment and magnetized distilled water plus acaricide treatment between day 7 to 21 (approximately 77 %). Concerning the employment of the industrial adjuvant named PCGATE in this research project, it appears that enhancing in acaricide efficiency may not be associated with decreasing the surface tension factor due to magnetic field. This study suggests the usefulness of magnetic field as an environment-friendly method to increase the effectiveness of the studied plant protection agent. Regarding various compounds and pests such researches are required for each case. |
| Keywords: |
| Chemical control, Henderson-Tilton formula, Magnetic field, Surface tension, Tetranychus urticae Koch |
| Status : Paper Accepted (Poster Presentation) |
