Evaluation of Capsicum Germplasm for Sources of Resistance to Rhizoctonia solani

in HortScience
Authors:
Rejah MuhyiDepartment of Agronomy and Horticulture, New Mexico State University, Las Cruces, NM 88003

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Paul W. BoslandDepartment of Agronomy and Horticulture, New Mexico State University, Las Cruces, NM 88003

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A reliable screening method to detect Rhizoctonia solani Kuhn resistance in chiles (Capsicum annuum L.) was developed using infested corn (Zea mays Bonaf.) kernels as inoculum. The most aggressive New Mexican isolate of R. solani (PWB-25) was used to screen 74 Capsicum accessions for resistance to root rot caused by the fungus. The accessions differed in resistance, with disease ratings ranging from 2.9 to 8.6 on a 0 (no disease) to 9 (seedling dead) scale. The percentage of resistant plants, those in the interaction phenotype index class 0, 1, 2, and 3, ranged from 2.4% to 77.1%. Nineteen accessions representing four species had ≥50% resistant individuals and would be useful in breeding programs.

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