Evaluation of potato genotypes against early blight (Alternaria alternata) of potato (Solanum tuberosum L.)

Early blight (Alternaria alternata) of the potato is most destructive disease in tropical and sub-tropical countries. Natural epidemics early are strongly influenced by environmental conditions, even though severe appears every year northern India. Twenty-eight genotypes were used this study to differentiate between resistance susceptible selected represent a range reactions when screened field conditions. Out twenty-eight genotypes/varieties, six viz., CP-3021, 3153, Atlantic, Chip-3, Jx-161 MS/78-62 showed resistant reaction. While thirteen moderately resistant. However, while three highly susceptible. Resistant varieties can be simplest, effective economical method plant control. The use cannot only ensure protection against diseases but also save time, energy money spent on other control methods.