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The response of dusky cotton bug (Oxycarenus laetus) kirby in Bt. and non-Bt. cotton varieties at agro eco-climatic conditions of District Khairpur, Pakistan

Muhammad Mithal Rind, Hakim Ali Sahito, Rabia Noreen, Nadir Ali Rind, Nisar Ahmed Jatoi, Akhtar Hussain Shar, Khalid Hussain Rind

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Int. J. Biosci.18(5), 224-230, May 2021

DOI: http://dx.doi.org/10.12692/ijb/18.5.224-230


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Dusky cotton bug (DCB) observed throughout the year nearly in all plants and adapted to survive on alternate host plants. In the present research work, different Bt. and non-Bt. cotton varieties were sown at Agro eco- climatic conditions at Cotton Agriculture Research Station Kotdiji (CARSK), district Khairpur, Sindh under field conditions. The first appearance of the DCB on Bt. and non-Bt varieties were recorded in September and the peak population noted during October. The principal component of different Bt. and non-Bt. varieties based on the two groups, the first component accounts for 80.35% of the variance, while, the second component accounts for 7.07% of variance. The results indicated that the optimum humidity (24-32%) and temperature (20-36 oC) for the multiplication of DCB were recorded in Bt. and non-Bt. cotton. It was observed that no variety remained resistance against pest. The DCB population was found in both Bt. and non-Bt. varieties and found no variety resistance against the DCB pest, however, it was also observed that the few varieties were noted with a low DCB population. The regression analysis indicated that the DCB was strongly correlated with humidity and temperature in both Bt. cotton and non-Bt.cotton. Therefore, it is concluded that Bt. cotton varities such as Bt. CIM-602, Bt.-121 and non Bt. cotton varieties Sindh-1 and CRIS-533 cotton varieties considered as more resistant against the DCB pest in agro. eco-climatic region of the district Khairpur Pakistan.


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The response of dusky cotton bug (Oxycarenus laetus) kirby in Bt. and non-Bt. cotton varieties at agro eco-climatic conditions of District Khairpur, Pakistan

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