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Need for growing non-Bt cotton refugia to overcome Bt resistance problem in targeted larvae of the cotton bollworms, Helicoverpa armigera and Pectinophora gossypiella
Egyptian Journal of Biological Pest Control ( IF 2.4 ) Pub Date : 2021-02-19 , DOI: 10.1186/s41938-021-00384-8
Muhammad Rafiq Shahid , Muhammad Farooq , Muhammad Shakeel , Misbah Ashraf , Zia Ullah Zia , Saghir Ahmad , Abid Mahmood

The effectiveness of Bacillus thuringiensis (Bt) cotton against target arthropod larvae is decreasing day by day. The comparative effect of Bt expression among Bt cotton varieties and different plant parts was observed against the cotton bollworms: Helicoverpa armigera and Pectinophora gossypiella larvae. In the present study, larval mortality of H. armigera was higher than P. gossypiella among selected Bt cultivars. Median lethal concentration (LC50) values were 8.91, 13.4, 14.0, and 36.4 for P. gossypiella, while 5.91, 4.04, 2.37, and 8.26 for H. armigera of FH-142, MNH-886, IR-3701, and FH-Lalazar, respectively. These values depicted that P. gossypiella had more Bt resistance problem than H. armigera larvae. The host range of both targeted insect larvae was different from each other due to the polyphagous feeding nature of the larvae of H. armigera that feed on different host plants, but P. gossypiella attacked only cotton with monophagous feeding habit. It was also notable from results that Bt expression in reproductive parts where the attacked pink bollworm was lower than the American bollworm, so the former had the maximum chance of resistance due to repeated exposure to Bt. It was concluded that farmers be advised to follow the practice of growing non-Bt as a refuge crop to reduce the problem of Bt resistance in the target arthropod species.

中文翻译:

极品非增长的Bt棉避难所克服转Bt基因在棉铃虫的针对性幼虫,耐药问题棉铃虫棉红铃虫

苏云金芽孢杆菌(Bt)棉对目标节肢动物幼虫的有效性日益降低。观察到Bt棉花品种和不同植物部位之间的Bt表达对棉铃虫(Helicoverpa armigera)和棉铃虫(Pectinophora gossypiella)幼虫的比较效果。在本研究中,在选定的Bt品种中,棉铃虫的幼虫死亡率高于棉铃虫。FH-142,MNH-886,IR-3701和FH-F的棉铃虫对棉铃虫的致死浓度(LC50)值分别为8.91、13.4、14.0和36.4。拉拉扎,分别。这些值表明,棉铃虫比棉铃虫幼虫对Bt的抵抗力更强。由于H幼虫的多食性,两种目标昆虫幼虫的寄主范围彼此不同。棉铃虫以不同的寄主植物为食,但棉铃虫仅攻击具有单相食性的棉花。从结果还值得注意的是,受攻击的粉红色棉铃虫的繁殖部位的Bt表达低于美洲棉铃虫,因此由于反复暴露于Bt,前者具有最大的抵抗机会。结论是,建议农民遵循种植非Bt作为避难作物的做法,以减少目标节肢动物物种对Bt的抗性问题。
更新日期:2021-02-19
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