Resistance of non-Bt., cotton varieties against sucking pests under vitro conditions at Sindh, Pakistan

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Research Paper 01/09/2019
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Resistance of non-Bt., cotton varieties against sucking pests under vitro conditions at Sindh, Pakistan

Hakim Ali Sahito, Zafar Hussain Shah, Tasneem Kousar, Wali Muhammad Mangrio, Faheem Ahmed Jatoi
Int. J. Biosci.15( 3), 514-523, September 2019.
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The different non transgenic cotton varieties (n=09) namely; T1= Sindh-1, T2= Bakhtawar, T3= CRIS-9, T4= CRIS-129, T5= CRIS-121, T6= CRIS-342, T7= CRIS-134, T8= Marvi (CRIS-5A) and T9= CRIS-467 were cultivated to check their varietal resistance against most devasting sucking pests such as; Jassids, whiteflies, thrips and mealybugs under un-sprayed field conditions during, 2018. An experiment was laid out in a Randomized Complete Block Design (RCBD) had nine treatments of size 100sq feet and replicated four times. Twenty plants were randomly selected for data collection from each variety on weekly basis. The maximum mean of the jassid population was observed on CRIS-9 (4.21) and minimum on CRIS-467 (2.22) per leaf. The maximum whiteflies were recorded on CRIS-342 (11.74) and minimum on CRIS-467 (7.38). The maximum thrips were found on Sindh-1 (13.60) and minimum on Marvi (CRIS-5A) (8.62). The maximum mealybugs were observed on CRIS-121 (2.61) while minimum on CRIS-134 (0.43). In overall resistivity of nine non-Bt., cotton varieties, two varieties Marvi (CRIS-5A) and CRIS-467 showed overall good resistance against sucking complex (5.16) and (5.33) respectively, followed by CRIS-129 (5.75), CRIS-121 (5.84), whereas; CRIS-9 (6.05), CRIS-134 (6.20) and Bakhtawar (6.26) showed average resistivity against sucking complex, while cotton varieties Sindh-1 (7.04) and CRIS-342 (7.01) were found to be less resistive and most infested non-Bt., varieties among the tested varieties. So it was concluded that Marvi (CRIS-5A) and CRIS-467 gave good resistance against the above mentioned four sucking pests. Therefore, it is recommended that these varieties Marvi (CRIS-5A) and CRIS-467 should be grown as these were less infested by sucking complex.


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