Document Type : Research Paper
Authors
1
Associate Professor, Plant Protection Research Department, Isfahan Center for Research and Education in Agricultural Science and Natural Resources, (AREEO), Isfahan, Iran
2
M.Sc. Expert, Plant Protection Research Department, Isfahan Center for Research and Education in Agricultural Science and Natural Resources, (AREEO), Isfahan, Iran
Abstract
The early blight disease of potato caused by Alternaria alternata and A. solani is one of the most important epidemic diseases of potato crop in Iran, out of which A. alternata is the dominant one. For resistance sources, 24 potato cultivars which are grown throughout Iran were assessed at greenhouse and field conditions. The infection percentages, severity, and disease scoring scales means showed that the cultivars Markies, Kennebeck, Premiere, Atlantic, Sante, Sonate, and Agria were the most susceptible ones under greenhouse conditions. However, the cultivars Granula, Diamont, Picasso, Maradona, and Kayzer were the most resistant ones and were ranged in the significant and respective groups of statistical analysis. The other cultivars reacted intermediately with a moderately resistance, tolerance, and moderately susceptible reactions with significant effects. The field results also showed almost the same results as for greenhouse experiments with significant statistical groups and distinct on the basis of the disease developments. The disease expansion in advanced stages of the crop growth showed an ascending level of developments in a varying degree with high significant effects, indicating that, the cultivars reacted independently and were distinct from each other on the basis of disease severity and scoring scale.
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