Sources of resistance to bacterial blight and black arm in cotton (Gossypium hirsutum L.) [Philippines]
1986
Dizon, T.O. | Reyes, T.T. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
Bacterial blight and boll rot, caused by Xanthomonas campestris pv. malvacearum, are serious diseases of cotton. The organism attacks leaves, stems and bolls causing leaf blight, black arm and boll rot, respectively. A total of 136 cotton lines were evaluated for their reaction to leaf blight. Of these, 57 were rated highly resistant, 38 were resistant and the rests were either susceptible or highly susceptible. Out of the 92 lines screened against black arm, 38 were found highly resistant, 27 were resistant, 22 were moderately susceptible and the rests were rated susceptible to highly susceptible. None of the 77 lines evaluated against boll rot showed resistant reaction. The correlation between leaf, stem and boll resistance to Xanthomonas campestris pv. malvacearum was determined. Using 60 cotton lines, only three lines, namely, Deltapine 16, Deltapine 61 (Australia) and Deltapine 90 showed a positive correlation, while the rests exhibited varying reactions to leaf, stem and boll infections. All lines were rated moderately susceptible to highly susceptible to boll rot. About 41 lines were rated highly resistant to both leaf and stem infections.
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