摘要
通过对转 Bt基因抗虫棉田棉铃虫的系统调查研究表明 :(1)转 Bt基因抗虫棉对棉铃虫蛾、卵无抗性表现 ,田间落卵量与常规棉田无明显差异 ,相反 ,二代棉铃虫百株累计卵量倒比常规棉处理区增加了 2 16～ 2 74粒 ,增长幅度为 30 %～ 38% ;(2 )转 Bt基因抗虫棉对二代棉铃虫幼虫的抗性及控制作用较强 ,基本不用进行药剂防治 ,但对三代棉虫幼虫的抗性控制效果明显下降 ,田间 3龄以上幼虫平均达2 0～ 4 0头 /百株 ,多者达 6 0头以上 ,仍需进行必要的药剂防治 ;(3)棉铃虫在转 Bt基因抗虫棉株上的危害特点与常规棉株有明显的差异 ,表现在幼虫和危害症状均较隐蔽 ,不易被发现。
The investigation of the dynamics of the cotton bollworm was made in Bt transgenetic cotton fields.The results showed that the cotton bollworm eggs capacity in Bt transgenetic cotton fields in 30%～38% higher than that in the contrast cotton fields.Bt transgenetic cotton showed a high resistance and a suppressing effect on the population density to the second generation of cotton bollworm while both resistance and suppressing effect apparently reduced to the third generation of cotton bollworm.The fact that there are about 20～40 larvaes of 3～5 instar on 100 cotton plants indicated chemical control is needed.
出处
《昆虫知识》
CSCD
2000年第3期146-148,共3页
Entomological Knowledge
基金
河北省科委重点研究项目内容
