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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Spatial and temporal variation in susceptibility of the American bollworm, Helicoverpa armigera (Hubner) to Bacillus thuringiensis var. kurstaki in India
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Spatial and temporal variation in susceptibility of the American bollworm, Helicoverpa armigera (Hubner) to Bacillus thuringiensis var. kurstaki in India

机译：美国棉铃虫棉铃虫对苏云金芽孢杆菌变种的敏感性的时空变化。印度库尔斯塔基

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摘要

Studies were carried out to determine the baseline susceptibility of the American bollworm, Helicoverpa armigera to Bacillus thuringiensis var, kurstaki (B.t.k.) HD-1 and HD-73 strains for the populations collected from different places in India. The populations from Delhi (field), Raichur (F-1 and F-2) and Bangalore were least susceptible to the toxicity of B.t.k, HD-1. On the contrary, the Hyderabad and Madurai populations were most susceptible. B.t.k. HD-1 caused neonate mortality of 37.4% at 10 ppm and 68.6% mortality at 100 ppm after 96 h of treatment. Mehna and Nagpur populations were least susceptible to B.t.k, HD-73 whereas Guntur, Bapatla, Hyderabad, Madurai and Vijayawada populations were most susceptible. HD-73 caused mortality of 62.3 % at 100 ppm and 91.7% at 500 ppm after 96 h of treatment, Temporal variations of insect mortality showed that LC50 (96 h) of B.t.k, HD-1 increased from 9.47 ppm in October 1998 to 51.04 ppm in December 1998 for the insect population on pigeonpea in Delhi, The baseline susceptibility studies show that there is a possibility of tolerance (resistance) in some populations. These studies are discussed in relation to their importance vis-ci-vis growing use of B.t.k. and future cultivation of B.t. transgenic crops in the country, [References: 32]
机译：进行了研究以确定美洲棉铃虫棉铃虫对苏云金芽孢杆菌变种，库尔斯塔基（B.t.k.）HD-1和HD-73菌株的基线敏感性，这些基线敏感性来自印度不同地区。来自德里（田野），赖克尔（F-1和F-2）和班加罗尔的人口对B.t.k，HD-1的毒性影响最小。相反，海得拉巴和马杜赖人口最容易受到感染。 B.t.k.治疗96小时后，HD-1在10 ppm时导致新生儿死亡率为37.4％，在100 ppm时为68.6％死亡率。 Mehna和Nagpur人群最容易受到B.t.k，HD-73的感染，而Guntur，Bapatla，Hyderabad，Madurai和Vijayawada人群最容易受到感染。在处理96小时后，HD-73导致100 ppm时死亡率为62.3％，在500 ppm时为91.7％。昆虫死亡率的时间变化表明Btk，HD-1的LC50（96 h）从1998年10月的9.47 ppm增加到51.04。 1998年12月，在德里的木豆上的昆虫种群中，Pb的百分数为ppm。基线敏感性研究表明，在某些种群中有耐受性的可能性。讨论了这些研究相对于B.t.k的日益使用的重要性。和未来的种植该国的转基因作物，[参考文献：32]

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