Selection of cassava genotypes resistance to dry root rot
DOI:
https://doi.org/10.52945/rac.v33i1.498Keywords:
Fusarium solani, F. oxysporum, resistanceAbstract
Dry root rot is the most damaging disease of cassava (Manihot esculenta Crantz). Yield reduction caused by the disease range from 30% to 100%. This work aimed to assess cultivars and advanced clones from the cassava’s genetic breeding program of Epagri for resistance to dry root rot caused by Fusarium solani. A suspension of F. solani spores was inoculated on root discs of 21 cassava genotypes, in a concentration of 1.5 x 10 7 conidia mL-1 in four experiments. The disease severity was assessed through the percentage area colonized by the fungus. Stems of the more promising genotypes in resistance tests were selected for tests with F. solani in greenhouse. The cultivar Luna has potential to be used in F. solani infested areas and/or as progenitor for the breeding program, as it was the more resistant and presented high values of mass of aerial part and roots among the genotypes tested. Also the genotypes SC12-5035 and SC12-5029 showed potential for use in integrated
management of the disease.
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