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題名 | 蟲生線蟲(Steinernema taiwanensis Strain T39)對斜紋夜蛾及甜菜夜蛾(鱗翅目:夜蛾科)致病力之比較=Pathogenicity of the Entomopathogenic Nematode, Steinernema taiwanensis Strain T39, against Two Noctuids, Spodoptera litura and Spodoptera exigua (Lepidoptera: Noctuidae) |
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作者 | 曾慶慈; 侯豐男; 唐立正; | 書刊名 | 臺灣昆蟲 |
卷期 | 37:2 2017.09[民106.09] |
頁次 | 頁51-63 |
分類號 | 433.3 |
關鍵詞 | 蟲生線蟲; 斜紋夜蛾; 甜菜夜蛾; 致病力; Entomopathogenic nematode; Pathogenicity; Spodoptera litura; Spodoptera exigua; |
語文 | 中文(Chinese) |
中文摘要 | 本試驗以生物檢定研究台灣本地產蟲生線蟲 (Steinernema taiwanensis strain T39) 對斜紋 夜蛾 (Spodoptera litura Fabricius) 及甜菜夜蛾 (Spodoptera exigua Hübner) 之致病力。溫度 對致病力之測試結果顯示,雖因昆蟲種類不同導致其表現略有差異,然而 S. taiwanensis strain T39 適宜溫度範圍介於 25~35o C,在 20o C 以下則無死亡率發生。不同濃度之 S. taiwanensis strain T39 懸浮液接種斜紋夜蛾幼蟲,結果顯示五齡或六齡幼蟲對含防腐劑或未含防腐劑飼料處理組間 之最終寄主死亡率均無顯著差異,然在飼料內未含防腐劑者所得之 LT50 皆較含防腐劑組為低,且 線蟲對六齡幼蟲之致病力較五齡幼蟲為佳。接種濃度 20 IJs/mL 時,取食未含防腐劑或含防腐劑 飼料之斜紋夜蛾五齡幼蟲,其半致死時間 (LT50) 分別為 37.9 及 39.9 h;接種濃度為 25 IJs/mL 者之六齡幼蟲 LT50則為 27.0 及 28.4 h。以甜菜夜蛾供測,則在同樣處理下接種濃度 20 IJs/mL 之五齡幼蟲之最終死亡率與斜紋夜蛾之試驗結果間無顯著差異,然其 LT50為 27.2 h 明顯較短,顯 示 S. taiwanensis strain T39 對甜菜夜蛾之致死速率較斜紋夜蛾為快。綜合上述試驗結果證實, S. taiwanensis strain T39 對斜紋夜蛾及甜菜夜蛾具有殺蟲效力。 |
英文摘要 | The pathogenicity of the entomopathogenic nematode, Steinernema taiwanensis strain T39, isolated from Taiwan was determined using bioassays against two noctuids, Spodoptera litura and Spodoptera exigua. When incubated both noctuid larvae after the inoculation with the nematode suspension at different temperatures, the results showed that, although mortalities varied within host species, the optimum temperatures for S. taiwanensis infection were 25-30o C. However, the inoculated larvae of both insect species did not exhibit any mortality at temperatures below 20o C. Inoculation of S. litura larvae with three concentrations of S. taiwanensis did not reveal any significant difference in cumulative mortalities among various treatments; however, the median lethal time (LT50) values of fifth and sixth instar larvae fed on the diets without antiseptics were shorter than those on the antiseptic-containing diets. The LT50 values of fifth instar larvae fed on the diets with or without antiseptics after inoculation with S. taiwanensis at 20 IJs/mL were 37.9 and 39.9 h, respectively, whereas those of sixth instar larvae inoculated with the nematode at 25 IJs/mL were 27.0 and 28.4 h, respectively. In the other assay with S. exigua fed on diets without antiseptics, the cumulative mortalities caused by inoculation with S. taiwanensis at 20 IJs/mL were not significantly different; however, the LT50 value was ca. 27.2 h, which was shorter than that of S. litura, indicating that S. taiwanensis can kill S. exigua faster than S. litura. Therefore, it is suggested that S. taiwanensis is pathogenic to the larvae of both noctuid species. |
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