Leaf spots are the most serious foliar fungal diseases of groundnut (Arachis hypogaea L.) World wide. Early leaf spot and late leaf spots, singly or together can cause losses in pod yield of over 50% and reduce the quality of the pod and fodder. Screening of genotypes and advance breeding lines is one of the primary objective for resistance breeding in groundnut. Present investigation was carried out to screen 33 advance breeding lines and 7 released varieties of groundnut against early and late leaf spot diseases. Early leaf spot disease scoring was done at 35 and 45 days after sowing and late leaf spot scoring was done at 75 and 85 days after sowing on 1 to 9 scale. Dendrogram were constructed based on disease scoring data of both the diseases. Score 1-3 (0 to 20% disease) was given to highly resistance lines, 4-5 for moderately resistance (21 to 50%), 6-7 for susceptible (51 to 70%) and 8-9 for highly susceptible (71 to 100%) lines. For early leaf spot 13 highly resistant, 8 moderately resistant, 4 Susceptible and 15 highly susceptible lines were identified. For late leaf spot 13 highly resistant, 7 moderately resistant, 3 susceptible and 16 highly susceptible lines were identified. Total 12 highly resistant lines having resistant to both i.e., early and late leaf spot diseases were identified. Identified resistant lines can be used as source of resistance and for hybridization programme to develop new resistant variety.

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