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題名 | 三種植物油對二點葉蟎之致死效果=Acaricidal Efficacy of Three Vegetable Oils on Tetranychus urticae Koch (Acari: Tetranychidae) |
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作者姓名(中文) | 余志儒; 陳炳輝; | 書刊名 | 臺灣農業研究 |
卷期 | 58:2 2009.06[民98.06] |
頁次 | 頁136-145 |
分類號 | 433.3 |
關鍵詞 | 二點葉蟎; 椰子油; 棕櫚油; 油菜油; 介面活性劑HLB值; Tetranychus urticae; Coconut oil; Palm oil; Rapeseed oil; HLB-value of surfactant; |
語文 | 中文(Chinese) |
中文摘要 | 在室內25℃±1℃下測試三種植物油,椰子油、棕櫚油及菜籽油對二點葉蟎(Tetranychus urticae Koch)的致死效果。三種植物油分別與HLB值為5.3、10.8及6.7非離子介面活性劑以1:1(V/V)混合,介面活性劑用Span 80與Tween 80調製。結果顯示椰子油、棕櫚油及介面活性劑確實具有殺蟎能力,菜籽油則幾乎沒有,致死效果可能與飽和脂肪酸的含量有關。三種植物油的LC50在處理後72小時分別為2.23、2.59及3.66mL/L,LC90分別為10.62、7.53及17.82mL/L。介面活性劑的殺蟎效果與HLB值的大小似乎無關,除10mL/L濃度在處理後24小時與20mL/L濃度在處理後72小時之外,餘皆無顯著差異。本試驗結果顯示椰子油與棕櫚油在二點葉蟎的防治上具有發展潛力,可供相關研究做參考。 |
英文摘要 | Effects of three vegetable oils including coconut oil, palm oil and rapeseed oil on two-spot spider mite (Tetranychus urticae Koch) were examined under laboratory conditions (25℃±1℃). Nonionic surfactants were prepared using Span 80 and Tween 80. The hydrophile-lipophile balance (HLB) values were adjusted to 5.3, 10.8 and 6.7 and mixed with coconut oil, palm oil and rapeseed oil, respectively, at the ratio of 1:1 (V/V) to prepare emulsified solutions. Each of the emulsions was diluted with distilled water to the oil concentrations of 20, 10, 5, 2.5 and 1.25mL/L and then used for the experiments. The surfactant used in each vegetable oil was also diluted to 20, 10, 5, 2.5 and 1.25mL/L and used as controls. Results showed that among the three vegetable oil emulsions tested, coconut oil and palm oil were acaricidal on T. urticae. After treatment for 72 h, the LC50 for coconut oil and palm oil was 2.23 and 2.59mL/L, respectively and the LC90 was 10.62 and 7.53. The acaricidal effect seemed to be related to high saturated fatty acid content in the coconut and palm oils. Acaricidal function of surfactants was unaffected by HLB-value excepted for the concentrations of 10mL/L at 24 h after treatment and 20mL/L at 72 h after treatment. Results of this study also showed that the three surfactants at HLB-values of 5.3, 10.8 and 6.7 were acaricidal on T. urticae. This study suggests that coconut oil and palm oil may be of potential for use in the formulation of acaricides for control of T. urticae. |
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