Abstract

MACIAS DUARTE, Rubén et al. Efficiency of different fungicides to control pink root rot in onions. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.8, pp.1933-1943. ISSN 2007-0934.

Onion cultivation in Mexico is of great economic importance and during 2014, 48170 ha were established, one of the main problems for its production is the presence of diseases in the soil. The aim of this study was to evaluate different chemicals and biological fungicides to control pink root rot and its effect on yield. The research was conducted at INIFAP in the Experimental field Coast Hermosillo, Sonora, Mexico, during the years 2010 and 2011. The design was randomized blocks with three replications. Treatments applied did not affect statically the incidence percentage of pink root rot nor plant height; however, it had effect on the severity of the disease, bulb weight and yield. In 2010 the incidence ranged from 39 to 73% and severity of damage between 10-34% and fungicides with greater control were methyl thiophanate (MT), benzothiazole tiocianometitio (TB) and the combination of TB + Trichoderma harzianum although without improving yield. In 2011 the incidence of the disease ranged from 22-30% and the severity of damage of 14-30%. The applications of Trichoderma harzianum alone or in combination with TB were those that achieved greater weight bulb and promoted an increase in yield of 16% compared to control. The application of chemical and biological fungicides is a short-term alternative to reduce pink root rot in onions.

Keywords : Allium cepa L.; disease; quality; yield.

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