SENSITIVITY IN VITRO OF Pseudocercospora griseola STRAINS TO FUNGICIDES

摘要

The common bean is one of the most important crops for Brazil. Among the factors that reduce yield and cause production instability are pathogens, especially fungi. Angular spot is an important fungal disease in the crop and is caused by the fungus Pseudocercospora griseola (Nay et al., 2019). This disease occurs in all regions where this legume is cultivated (Goncalves-Vidigal et al., 2016). In addition to genetic resistance, another form of angular leaf spot control is the use of fungicides. In Brazil there are 106 registered fungicides (commercial products) that can be used to control the disease, especially the groups of benzimidazois, dithiocarbamates, inorganics (copper and tin), strobilurins, triazoles and some mixtures of these groups (Agrofit, 2019). However, resistant strains of P.griseola can arise in the population due to great variability of this pathogen, as well as due to the sporulation, spread and successive applications of the same active ingredient or the same fungicide chemicalgroup (Garcia, 1999). These resistant strains can predominate in the population and the product loses its efficiency. Therefore, it is necessary to monitor the sensitivity of P.griseola strains to the main recommended fungicides.