Screening of varieties of gladiolus under artificial epiphytotic conditions against Curvularia trifolii f. sp. gladioli
2013
Yadav, H. S. (Hanuman Singh) | Singh, P. J.
Gladiolus is an important commercial crop having major role as a cut flower in the domestic market. Curvularia leaf spot caused by Curvularia trifolii f. sp. gladioli causes significant loss to this crop. The early-sown gladioli, which sell at a premium price in the market, suffer from a high incidence of Curvularia leaf spot in the North Indian Plains due to high temperature and humidity prevailing at that time. Fifty varieties of gladiolus were screened in the field under artificial epiphytotic conditions against the disease. None of the varieties was found to be immune to the disease. Nine varieties, namely SJN, Yellow Stone, Plum Tart, Jacksonville Gold, Pink Elegence, Delhi Pink, Shagun, Arka Kesar and Punjab Flame showed very good level of genetic resistance against the disease (disease reaction: ≤ 1.0). Nineteen varieties were found to be moderately resistant (disease reaction: >1.0–2.0); while, eleven varieties were moderately susceptible (disease reaction: >2.0–3.0) to the disease. Eleven varieties, namely Jester, Chandani, Punjab Dawn, Gunjan, Shobha, Solist, Jessica, Aldebaran, Purple Flora, Overture and Alexander the great were observed to be susceptible to the disease (disease reaction: >3.0–4.0). Among the susceptible varieties, Alexander the great and Overture were found to be the most susceptible to leaf spot, having disease reaction of 4.0. The resistant varieties may be used as such or exploited in the breeding programme for development of suitable varieties. Cultivation of appropriate resistant varieties may lead to significant reduction in losses caused by the Curvularia fungus.
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