| Bt农药对“桂蚕一号”家蚕毒性的测定 |
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| 引用本文： | 李国军,韦秉兴,韦绥概,廖耀民,邱海洪.Bt农药对“桂蚕一号”家蚕毒性的测定[J].广西蚕业,2008,45(4):15-19. |
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| 作者姓名： | 李国军 韦秉兴 韦绥概 廖耀民 邱海洪 |
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| 作者单位： | 1. 广西大学农学院,南宁市,530005
2. 南宁市蚕业站,南宁市,530005 |
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| 基金项目： | 广西区南宁市重点攻关课题
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| 摘 要： | 采用浸叶饲喂法，测定了Bt农药对广西现行夏秋用家蚕品种“桂蚕一号”的毒性。结果显示：添食Bt农药浓度越高，家蚕的死亡率越高，且随着感染时间的延长，对家蚕的LC50也越小；对3龄和5龄家蚕72h的持续毒性LC50分别为32．37mg／L和358．04mg／L，其相对毒性比接近11：1，说明小蚕比大蚕较为敏感。因此，建议在蚕区其他作物上应谨慎用Bt农药，以减少和避免对桑蚕业安全生产的威胁。
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| 关 键 词： | Bt农药(苏云金杆菌) 家蚕 毒性 |
Measurement of Toxicity of Bt Preparationon "Guican NO.1"Silkworm variety |
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| Li Guo-jun,Wei Bing-xing,Wei Sui-gai,Liao Yao-min,Qiu Hai-hong.Measurement of Toxicity of Bt Preparationon "Guican NO.1"Silkworm variety[J].Guangxi Sericulture,2008,45(4):15-19. |
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| Authors: | Li Guo-jun Wei Bing-xing Wei Sui-gai Liao Yao-min Qiu Hai-hong |
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| Institution: | Li Guo-jun, Wei Bing-xing, Wei Sui-gai,Liao Yao-min, Qiu Hai-hong(1.College of Agriculture, Guangxi University, Nanning 530005; 2. Sericuhure terminus of Nanning City, Nanning 530005) |
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| Abstract: | Toxicity of Bt WP to larvae of Guican No.1 ,which is a normal variety of Bombys mori.L, reared customarily in autumn and summer in Guangxi region,was measured by dipped-leaf feeding on. The results showed that the higher the density was,the higher the morality was,and the half lethal concentration （LC50） was lower as the time continued; The LC50 against the third instar silkworms and the fifth instar ones were 32.37 mg/L and 358.04 mg/L respectively,and the proportion of their LC50 was 11 ： 1 ,which indicated that the small silkworms were more susceptible than the big ones. Therefore,there is a suggestion that Bt WP should be applied carefully in cultivating-silkworm area and on sericulture so that the serious threat on security of sericulture should be decreased or avoided. |
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| Keywords: | Bt （Bacillus thuringiensis） Bombys mori L Toxicity |
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