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• W24703303 abstract "2NexGen Technologies, 8-2-684/J/8/A, Road No. 12, Banjara Hills, Hyderabad 500 034, India A stochastic model ‘Bt-Adapt’ was developed to simulate the rate of resistance development of Helicoverpa armigera to Cry1Ac under Indian farming conditions. The model integrates genetic and ecological parameters of H. armigera in relation to its response to the Cry1Ac expressing Bacillus thuringiensis (Bt)-cotton. Simulation analysis showed that relative survival rate of the Cry1Ac-resistant homozygous (RR), heterozygous (RS) and homozygous susceptible (SS) H. a rmigera genotypes on Bt-cotton, was the most important factor influencing resistance development. In the o rder of significance, the other factors that had the greatest impact on resi stance development were the relative proportion of area under Bt-cotton, dominance of the resistant allele and initial frequency of resistant alleles in field populations. The extent of population redu ction in Bt-cotton and non-Bt crops due to pest control, was found to have a significant impact on the rate of resistance development. Simulation studies showed that cultivation of Bt-cotton in 10, 20, 30 and 40% of the total area under cotton, is likely to result in resi stant allele frequency reaching 0.5, which would be adequate to cause crop failure, after 54, 25, 16 and 11 years respectively, if no pest control mea sures were adopted in both Bt-cotton and non-Bt crops. With a pest control efficacy of 0.9 in Bt-cotton and 0.5 in nonBt crops, it would take 70 and 45 years for resistant allele frequency to reach 0.5 with the Bt-cotton area at 30 and 40% respectively. Based on the simulation analysis, resistance management strategies are proposed with emphasis on reducing populations of H. armigera that survive Bt-cotton and enhancement of area of alternate host crops that are as attra ctive as cotton to H. armigera, to be used as trap crop or intercrop refuges. GENETICALLY modified cotton genotypes incorporating a crystal (Cry) toxin producing cry1Ac gene derived from Bacillus thuringiensis (Bt), were introduced in Ind ia for commercial cultivation in the year 2002. The transgenic crop, now popularly called Bt-cotton, represents the state of-the-art in pest management and holds great promise in controlling the cotton bollworm, Helicoverpa armigera (Hubner), which has developed resistance to all the co mmonly used insecticides in the country 1 . The technology is expected to provide cotton growers with significant ecological and economic advantages. It is now widely a cknowledged the world over that the benefits accrued from Bt-cotton outweigh risks substantially. However, one of the primary concerns of deployment of genetically eng ineered insect-resistant crops in a developing country like India, is the durability of resistance 2" @default.
• W24703303 created "2016-06-24" @default.
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• W24703303 date "2004-01-01" @default.
• W24703303 modified "2023-09-25" @default.
• W24703303 title "Modelling adaptability of cotton bollworm, Helicoverpa armigera (Hiibner) to Bt-cotton in India" @default.
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