Resumen

SEPULVEDA, Leonardo. Phenotypic characterization of Mycosphaerella fijiensis and its relation with sensitivity to fungicides in Colombia. Rev. mex. fitopatol [online]. 2016, vol.34, n.1, pp.1-21. ISSN 2007-8080.  https://doi.org/10.18781/R.MEX.FIT.1507.8.

Controlling Mycosphaerella fijiensis increasingly requires the use of greater amounts of fungicides due to the resistance this pathogen has developed. A phenotypic characterization of M. fijiensis isolates in relation to their sensitivity to fungicides pyraclostrobin, epoxiconazole and tridemorph was carried out, with the intention of complementing existing methods of resistance monitoring. From symptomatic leaf tissue gathered from 12 banana farms in Colombia in 2013 and 2014, monosporic isolates were obtained and their population sensitivity and individual sensitivity were measured. This sensitivity was then compared with phenotypic traits expressed by each isolate. Results indicated that the traits associated with a greater sensitivity to pyraclostrobin were expressed in a greater number of individuals; in addition, the expression of these same features was observed as response to epoxiconazole. For tridemorph, an apparent shared domain was observed among individuals with traits associated to low and high sensitivities. A phenotypic characterization would help find if there are more or fewer individuals tolerant to an active ingredient and to define the time most suitable to apply this active ingredient without increasing the selection pressure on these individuals.

Palabras llave : Pyraclostrobin; Epoxiconazole; Tridemorph; Selection pressure; Biological fitness.

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