棉 花 学 报 Cotton Science 2007,19(1):42-46
Influence of CCRI 45 on Survival and Growth of Ostrinia furnacalis Abstract:A transgenic Bt+CpTI cotton,CCRI 45,was used to test the insecticidal activity and inhibition of different organs to larvae of O. furnacalis using feeding bioassay. Bioassays in lab and with cages in fields were conducted,and field population and the damage of O. furnacalis were surveyed. The results of Bioassay in lab showed that the mortality of O. furnacalis of three generations feeding on different organs of CCRI 45 was higher than those feeding with CCRI 23,the resistance to the first generation of O. furnacalis was higher than that to the second. The resistance to the third generation was the lowest. The resistance to the first generation instar was higher than that to the third. The inhibition to the growth of third generation instar larvae of O. furnacalis feeding with different organs of CCRI 45 was significant. Adjusted decreasing rate of larvae weight of O. furnacalis from first to third generation were 57.58%,49.58%,31.65%,respectively. The result of cages experiments in fields showed that the numbers of holes in stem,buds and bolls of each CCRI 23 plant damaged by the second generation of O. furnacalis were 9.60,1.00,5.40,respectively,and larval survival rate of O. furnacalis was 16.00%.The numbers of holes in stem and bolls of each CCRI 23 plant damaged by the third generation of O. furnacalis were 2.00,4.00,respectively,and larval survival rate of O. furnacalis was 11.43%.
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