棉 花 学 报     Cotton Science    2007，19(1)：42-46

 

Influence of CCRI 45 on Survival and Growth of Ostrinia furnacalis
HUANG Dong-lin1，YANG Cui-mei1，SHI Xiao-li1，SUN Ya-ping1，LIU Han-qin1，Chen Jun1，BAI Li-xin2
(1.Department of Plant Protection，Agricultural College，Yangzhou University，Yangzhou 225009，China ； 2.Institute of Plant Protection，Jiangsu Academy of Agricultural Sciences，Nanjing 210014，China)

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%.
No damage and no insect of O. furnacalis of any stages were found in CCRI 45.The result of field population and the damage of O. furnacalis showed that the number of larvae per plant and the rate of damaged plants of CCRI 23 were 0.4，40.00，respectively. Our experiments clearly demonstrated that， the resistance of the bivalent cotton CCRI 45 to larvae of O. furnacalis was higher than CCRI 23.
Key words：Ostrinia furnacalis；transgenie cotton CCRI 45；resistance；inhibition  [Full Text，2100KB]