Identification of groundnut genotypes and wild species resistant to stem rot using an efficient field screenin technique
Keywords: Groundnut, Sclerotium rolfsii, Stem rot, interspecific derivatives, post-rainy
AbstractStem rot of groundnut caused by S. rolfsii Sacc. is one of the major constraint to groundnut production in many countries. The fungus is ubiquitous, soil in habitant and non-target. Screening of groundnut genotypes for resistance to stem rot under field conditions is complicated by the non-uniform spatial distribution of the pathogen. While development and maintenance of artificial sick plot with optimum inoculums load under field conditions are also difficult because of sensitivity of the pathogen to temperature, humidity, soil type, cropping system and host preference. In the present study a simple screening technique under field conditions with high disease pressure and greater repeatability has been reported. Twenty-five wild Arachis accessions and 178F3progenies were screened under pot and field conditions, respectively for resistance to stem rot. Two wild Arachis accessions and threeF3 lines were found resistant to stem rot with disease scoring less than 20% and 10%, respectively.
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