Effect of temperature on rust and leaf spot disease development in groundnut

Rao, A.S.; McDonald, D.; Reddy, K.R.

Journal of Oilseeds Research 14(2): 249-255


Accession: 003113758

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Studies on the development of early leaf spot (ELS) (Cercospora arachidicola [Mycosphaerella arachidis]), late leaf spots (LLS) (Phaeoisariopsis [M. berkeleyi]) and rust (Puccinia arachidis) diseases of groundnut (Arachis hypogaea) in relation to temperature were carried out under laboratory conditions using 3 groundnut genotypes of varying disease resistance. Results showed that rust, ELS and LLS initiation and development were more rapid on susceptible than on resistant genotypes. Rust and LLS resistant genotypes had increased incubation periods, decreased infection frequencies and leaf area damage, and reduced lesion diameters and sporulation indexes. Rust and leaf spot disease development was highest at temperatures of 20-30 degrees C. None of the three diseases established at temperatures below 10 degrees C and above 35 degrees C.