Evaluation of nutrient dense groundnut lines for groundnut rosette and leafspot disease resistance at National Semi-Arid Resources Research Institute, Serere, Uganda
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Groundnut production is constrained by diseases such as groundnut rosette and leafspots. National Groundnuts Improvement Programme at NaSARRI Serere recently introduced 35 Nutrient dense advanced lines from ICRISAT Malawi for selection and adaptation under Ugandan conditions. Groundnut rosette and late leafspots are the most important diseases of groundnuts in Uganda causing serious economic damages when not managed. The use of resistant cultivars is the only sustainable, affordable, and environmentally friendly approach to manage these diseases. There is however, no comprehensive study on the resistance of different nutrient dense lines to groundnut rosette and leafspot. The main aim of this study was to determine the performance of nutrient dense groundnut lines for yield and resistance to groundnut rosette and leaf spot diseases. A field experiment was conducted at the National SemiArid Resources Research Institute (NaSARRI), Serere in a Randomized Completely Block Design (RCBD). Thirty-five (35) nutrient dense lines were evaluated. Data was collected on disease severity scored on a scale from 0 - 9. Data was subjected to analysis of variance (ANOVA) using GenStat statistical package. Results revealed significant differences (P ≤ 0.05) in severities of rosette and leafspot diseases between nutrient dense lines at different weeks after emergence. Severity scoring revealed that three nutrient dense lines (CGV-SM 01514, ICGX-SM 14019-B-14-1-1-4-1 and ICGX-SM 14001-B-3-1-2-7-1) were resistant to rosette; while one nutrient dense line (ICGX-SM 14001-B-6-1-3-1-1 and Serenut2 (ICGV-SM 90704) were resistant to leafspot. Yield parameters (fresh and dry plot weight and weight of 10 seeds) were not significant (P > 0.05) between the nutrient dense lines. Line ICGX-SM 14001-B-6-1-3-1-1 however with a higher 10 seed weight, had a higher resistance to groundnut leaf spot and moderately high resistance to groundnut rosette diseases. The nutrient dense lines showing resistance and/or moderate resistance to both diseases should be evaluated nationwide for more consistency. This could be used for future crop improvement of groundnuts. Nutrient dense line ICGX-SM 14001-B-6-1-3-1-1 should be used as a check genotype since it showed promising results in the study. The nutrient density levels in thee lines need to be quantified under Ugandan condition.