Abstract

ANAYA-LOPEZ, José Luis et al. Selection of chili pepper genotypes resistant to pathogenic wilt disease complex. Rev. Mex. Cienc. Agríc [online]. 2011, vol.2, n.3, pp.373-383. ISSN 2007-0934.

In Mexico the most important root disease of the chili pepper crop is the wilt disease, it is primarily controlled with fumigants and fungicides that help to select resistant isolates and cause environment and health damage. A safe environmental option could be the resistant varieties cultivation, but there are few disease resistance varieties. This study's aim was to isolate the pathogens associated with chili pepper wilt disease in central and north of Mexico and to identify chili pepper resistant genotypes. During 2006 and 2007, chili pepper plants with wilt disease symptoms were collected in 118 lots from Chihuahua, Colima, Durango, Guanajuato, Querétaro, San Luis Potosí and Zacatecas, from which pathogens were isolated and pure cultures were obtained. They were individually or in mixtures inoculated to select resistant germplasm, in 44 chili pepper accessions of INIFAP's germplasm bank and 141 collections from Durango, Guanajuato, Michoacán, San Luis Potosí and Zacatecas. Fusarium spp., was isolated with a 42.6% frequency, Rhizoctonia solani 37% and Phytophthora capsici 3.9%. 26 collections were identified with at least one of them resistant to Fusarium spp., and six to R. solani. Only BG102 and BG107 accessions from the gene bank were resistant to P. capsici and to the group of three pathogens. These are potential materials to be used in chili pepper genetic improvement.

Keywords : Fusarium spp.; Phytophthora capsici; Rhizoctonia solani; chili pepper germplasm; Creoles of Morelos.

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