Abstract
Alternaria leaf spot caused by Alternaria helianthi has been considered as economically important disease. The present study was carried out to identify resistant or moderately resistant genotypes against the Alternaria leaf spot in field screening and artificial screening. Out of 115 genotypes screened in field 31 genotypes were moderately resistant, 60 genotypes were susceptible whereas 24 genotypes were highly susceptible. Resistance to Alternaria is reported to exhibit differential reactions with the environment, hence field screening alone is insufficient while choosing genotypes for further resistance breeding programme. Therefore genotypes which showed moderate resistance (31) and high susceptibility (24) were screened artificially, along with 4 checks. Moderate resistant reaction for Alternaria leaf blight disease was observed in 1B, COSF 7B, CSFI 5083, CSFI 5181, CSFI 5213, CSFI 5276, CSFI 5292, CSFI 5336, POP 449-1-2-4, CSFI 13034, CSFI 13043 and TNHSF 239-68-1-1-1, when artificially screened. These genotypes may be evaluated in hot spot areas along with the resistant check to confirm their disease reaction. Hence these genotypes are considered as potential parents for Alternaria resistance breeding programme.
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