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Bt棉叶对棉铃虫抗虫性的时空变化及气象因素的影响
引用本文:孟凤霞,沈晋良,褚姝频.Bt棉叶对棉铃虫抗虫性的时空变化及气象因素的影响[J].昆虫学报,2003,46(3):299-304.
作者姓名:孟凤霞  沈晋良  褚姝频
作者单位:南京农业大学农业部病虫监测与治理基础实验室,南京,210095
基金项目:国家自然科学基金 (39970494);教育部博士点基金 (2000030703)
摘    要:用叶片喂饲法,测定了转Bt基因棉不同叶位、不同生长时期的叶片对棉铃虫初孵幼虫抗虫性的时空变化,同时测定了大田和室内不同气象条件下生长的侧枝和苗期叶片对棉铃虫抗虫性的影响。结果表明:转Bt基因棉R19-137株系主茎第2~10叶的抗虫性最高,初孵幼虫处理5天后的平均死亡率为97.0%~100%,为害级别在1.0~1.1级;第11~16叶的抗虫性明显下降,平均死亡率为35.6%~67.6%,存活幼虫以2龄为主。7月下旬、8月下旬测定了不同部位侧枝叶片的抗虫性,平均死亡率分别为30.9%~44.9%和10.0%~30.0%,抗虫效果进一步下降。试验结果还表明,在室内外不同气候条件下生长的Bt棉叶片的抗虫性有显著差异。讨论了Bt棉抗虫性时空变化的可能原因与Bt棉推广中气候条件的重要性。

关 键 词:转Bt基因棉  棉铃虫  叶片抗虫性  时空变化  气象因素  
文章编号:0454-6296(2003)03-0299-06
修稿时间:2002年11月12

Temporal-spatial variation in efficacy of Bt cotton leaves against Helicoverpa armigera (Hübner) and effect of weather conditions
MENG Feng-Xia,SHEN Jin-Liang,CHU Shu-Pin.Temporal-spatial variation in efficacy of Bt cotton leaves against Helicoverpa armigera (Hübner) and effect of weather conditions[J].Acta Entomologica Sinica,2003,46(3):299-304.
Authors:MENG Feng-Xia  SHEN Jin-Liang  CHU Shu-Pin
Institution:MENG Feng-Xia,SHEN Jin-Liang*,CHU Shu-Pin
Abstract:The temporal-spatial variation in efficacy of transgenic Bt cotton leaves from different nodes of the main stem and in different growth stages against neonate larvae of the cotton bollworm, Helicoverpa armigera (Hübner) were determined using the leaf-feeding method. The effects of leaves from both lateral branches of cotton in the field and seedlings in laboratory grown under different weather conditions on the neonates of the cotton bollworm were examined. Results show that efficacy of the leaves from the 2nd to 10th nodes on the main stem of Bt cotton R19-137 was the highest, killing 97.0%-100% of larvae after 5 d feeding with 1.0-1.1 grades of leaf damage; the efficacy of the leaves from the 11th to 16th nodes decreased significantly with mortalities of 35.6%-67.6%, and survivors mainly in the 2nd instar. When the leaves from lateral branches of cotton in late July and late August were tested, mortalities of 30.9%-44.9% and 10.0%-30.0% occurred, respectively, indicating further decline of the control efficacy. The experiments also show significant influence of weather conditions, under which the Bt cotton grew, on the control efficacy of Its leaves. The possible reasons for temporal-spatial variations in efficacy of Bt cotton leaves against the cotton bollworm and the importance of weather conditions in Bt cotton application were discussed.
Keywords:transgenic Bt cotton  Helicoverpa armigera  leaf efficacy  temporal-spatial variation  weather factors  
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