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題名 | 蟲生線蟲(Steinernema carpocapsae)(線蟲綱:Steinernematidae)防治亞洲玉米螟(Ostrinia furnacalis)(鱗翅目:螟蛾科)之效力=Efficacy of the Entomopathogenic Nematode, Steinernema Carpocapsae (Rhabditida: Steinernematidae), Against the Asian Corn Borer, Ostrinia Furnacalis (Lepidoptera: Pyralidae) |
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作者 | 鄭旗志; 唐立正; 侯豐男; Cheng, Chi-chin; Tang, Li-chang; Hou, Roger F.; |
期刊 | 中華昆蟲 |
出版日期 | 19980300 |
卷期 | 18:1 1998.03[民87.03] |
頁次 | 頁51-60 |
分類號 | 433.3 |
語文 | chi |
關鍵詞 | 蟲生線蟲; 亞洲玉米螟; 致病力; 生物防治; Steinernema carpocapsae; Ostrinia furnacalis; pathogenicity; Biological control; |
中文摘要 | 蟲生線蟲(Steinernema carpocapsae)感染期的3齡幼蟲(IJ),對亞洲玉米螟 (Ostrinia furnacalis) 具有致病力, 其半數致死濃度 (LC �t ) 對 3、4 及 5 齡幼蟲分 別為 7.5、8.7 及 16.3 IJs/ml。 在 25 ℃及相對濕度接近 100% 的環境中, 以 200 IJs 處理亞洲玉米螟 3、4 及 5 齡幼蟲, 其半數致死時間 (LT �t ) 分別為 1.4、2.4 及 4.9 小時。並可造成 28.3% 蛹期死亡率,若蟲生線蟲數量由 200 IJs 降至 10 IJs 則蛹期死亡 率降至 6.7%,此數值與對照組間已無顯著差異。 將蟲生線蟲施用於玉米田,其殺蟲效力與 蘇力菌相仿,若加入膏劑保護,則可達到與化學藥劑陶斯松相近的殺蟲效力。進行不同施用 時機之試驗發現,先接昆蟲後施線蟲組的蛀孔數與蟲數較先施線蟲後接昆蟲組為少,由此結 果可知選擇適當的施用時機可提高防治的效果。 |
英文摘要 | The 3rd stage infective juvenile (IJ) of the entomopathogenic nematode, Steinernema carpocapsae, was found to be highly pathogenic to the Asian corn borer, Ostrinia furnacalis. Pathogenicity of nematodes to the 3rd, 4th, and 5th instar larvae of the corn borer was estimated by LC �t to be about 7.5, 8.7, and 16.3 IJs/ml, respectively. The LT �t value was determined to be 1.4, 2.4, and 4.9 h for 3rd, 4th, and 5th instar larvae, respectively, when exposed to 200 IJs. At the same quantity of nematodes, the pupal mortality was 28.3%. However, it was only 6.7% when the quantity of nematodes was lowered from 200 IJs to 10 IJs. Corn borer mortality was not significantly different between treatment with nematodes and application of Bacillus thuringiensis preparations on the sweet corn field. Efficacy of nematodes against the corn borer when protected in the form of paste was found to be similar to that of chlorpyrifos. Comparison of different application times showed that application of nematodes after larval infestation resulted in fewer stem cavities and lower numbers of larvae surviving than with application before infestation. Therefore, it is suggested that timing of nematode application may practically affect its effectiveness against corn borer larvae. |
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