S. Sarwar Alam, Mahmood-ul-Hassan, Jafar Hussain and M. Aslam
Abstract
Twenty advanced lines of cotton in the National Coordinated Varietals Trial were screened for cotton leaf curl disease (CLCuD) and seed cotton yield during the year 2007-08. The experiment was laid out according to RCB design in four replicates. All the cultural operations and plant protection measures were adopted in optimal fashion. A rapid and convenient modified scale for rating of CLCuD was developed for screening the material in the field for large population and also for single plants. Among these one line showed traces (Rating 2) of disease and was highly resistant. Nine lines were resistant having a rating of up to 3 and six were tolerant (Rating 4) while three were rated as moderately tolerant with rating of 5 and one line was found to be susceptible (Rating 6). The highest seed cotton yield (6033 kg ha-1 ) was found in VH-255 with a plant population ha-1 of 35557 and resistant to ClCuD followed by Cris 129 (5815 kg ha-1 seed cotton yield), and Cris 342 (5793 kg ha-1 seed cotton yield) with rating of 3. NIAB-846 rated 4 with the yield of 5794 kg ha-1 .
S. Sarwar Alam, Mahmood-ul-Hassan, Jafar Hussain and M. Aslam. (2009) SCREENING OF CANDIDATE VARIETIES IN NCVT (2007-08) FOR COTTON LEAF CURL VIRUS BY A MODIFIED DISEASE SCORING SCALE, , Volume 6, Issue 1 & 2.
