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Reactions and yield performance of three potato cultivars naturally infected with bacterial blackleg disease under irrigation practice
Abstract
Potato (Solanum tuberosum) has become an attractive winter crop in many arid irrigated areas where they are grown on relatively large commercial farms. Two field trials were conducted to assess Irish potato cultivars for their tolerance/reactions to natural infection of bacterial blackleg disease under irrigation practice. The experiment was laid out in a randomized complete block design with three replications. The incidence of blackleg disease in both first and second trials ranged from 1.70 to 100% with the highest (100%) recorded in Mirabel, which was highly significant (p≤0.05), 1.70% - 5.00% disease incidence recorded for Yellow and 15.00% and 16.70% in Christian Lady in both first trial and second trials respectively. Yellow cultivar had 89.60% and 94.50% emergence and these were significantly higher than 8.30% and 21.10% observed in Mirabel in both trials. The highest yield (2.06t/ha) was observed in Yellow cultivar followed by 1.86t/ha recorded for Christian Lady in second trial. Yellow cultivar was tolerant to bacterial blackleg, followed by Christian Lady, while Mirabel was susceptible. Yellow and Christian Lady cultivars proved to be promising cultivars in drought condition or low rainfall areas. Notwithstanding, Yellow cultivar was the most preferable for disease tolerant in drought conditions.
