Screening of cotton (Gossypium sp.) for resistance to bacterial blight and black arm caused by Xanthomonas campestris pv. malvacearum
1987
Dizon, T.O. | Reyes, T.T. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
Bacterial blight and black arm, caused by Xanthomonas campestris pv malvacearum, are serious diseases of cotton. Using cotton lines as differential hosts, the organism was identified as Race 14. A total of 136, 92 and 77 cotton lines and varieties were screened against bacterial blight, black arm and bacterial boll rot, respectively. Of these, 57 were rated highly resistant and 38 were resistant to bacterial blight; 38 were highly resistant and 27 were resistant to black arm. None of the 77 cotton lines and varieties evaluated for resistance to boll rot showed resistant reaction. The correlation between the resistance of the leaf, stem and boll to X. campestris pv malvacearum was determined. No close correlation existed between the resistance of the leaves, stems and bolls on 60 cotton lines and varieties evaluated. A close correlation, however, was noted between leaf and stem resistance on 38 lines.
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