Abstract

PEREZ-ACEVEDO, Celina E. et al. Diagnosis of symptoms and pathogens associated with pepper wilt in Central Valleys of Oaxaca. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.2, pp.281-293. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v8i2.50.

In Central Valleys of Oaxaca growing pepper (Capsicum annuum L.) it is of great economic, social and nutritional importance. However, production is affected by ‛pepper wilt’ (MCH) because it generates significant economic losses. In this sense, a rapid diagnosis was made of the pepper production system, management, symptoms and pathogens related to MCH, from June 2013 to March 2014, through field trips, interviews with 63 farmers and sampling of field in 27 communities. The agrosystems of pepper production are diverse in infrastructure used, acreage, crop management, pests and diseases. The water pepper is the most cultivated and producers get their own seed, use chemical fertilizers and pesticides to control pests and diseases. The different symptoms were observed and listed as pepper wilt various production sites in Central Valleys, and pathogens were related symptoms, Rhizoctonia and Fusarium, and two oomycetes: Phytophthora and Pythium. Also determined a significant relationship (X2, p< 0.05) between subregions visited and frequency of distribution of pathogens: in the regions of Coatlan-Sola of Vega and Ejutla-Ocotlan had higher incidence of Rhizoctonia and Fusarium, but Zimatlán -Tacolula and Etla also presented Phytophthora and Pythium. The results show the presence of two or more pathogens in the same site, and consequently higher incidence in the field of the disease.

Keywords : Capsicum annuum; Phytophthora capsici; Rhizoctonia solani; host-pathogen; pathogenicity.

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