Abstract

VALLEJO-GUTIERREZ, Alma Janeth; MEJIA-CARRANZA, Jaime; GARCIA-VELASCO, Rómulo  and  RAMIREZ-GERARDO, Marithza Guadalupe. Response of Capsicum pubescens genotypes to damage caused by the fungal wilt complex. Rev. mex. fitopatol [online]. 2019, vol.37, n.1, pp.50-70.  Epub Aug 21, 2020. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1809-3.

In the south of the State of Mexico the manzano pepper (Capsicum pubescens R. and P.) is an economically important crop, but is affected by the “wilt disease”, a root disease that causes the death of the plant. The objective was to identify the associated organisms and evaluate the variation in response to the damage of wilt using 16 genotypes (M1-M16) of manzano pepper. Segments of infected plants were sown in PDA and 3P culture medium. The associated organisms were morphologically and molecularly identified. To evaluate the pathogen-genotype interaction, associated organisms were inoculated alone and their combinations in C. pubescens. Fusarium oxysporum, Phytophthora capsici and Rhizoctonia solani, were identified as the main cause of wilt, in which there were differences in severity and incidence between colonies of F. oxysporum (P≤0.01), and P. capsici (P≤0.05). There were significant differences (P≤0.01) in pathogenicity between P. capsici, F. oxysporum and R. solani, and combinations among them. Variation in resistance to wilt was observed, where M8 was the genotype that showed resistance to F. oxysporum and R. solani, and M9 tolerance to F. oxysporum. These can be used in breeding for the development of resistant genotypes.

Keywords : Manzano pepper; Phytophthora capsici; Rhizoctonia solani; Fusarium oxysporum.

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