| Cercospora leaf spot or Cercospora spot, caused by Cercospora beticola Sacc is the most common disease in the leaf beet cultivation. This study aimed to determine the mycelial sensitivity in vitro, measured by the IC50 (concentration for 50% inhibition of mycelial fungus growth) of three isolates of C. beticola of sugarbeet leaves obtained in Guarapuava region (PR) to the fungicide copper oxychloride shield in controlling the Cercospora spot as well as the production of cercosporin. We tested six copper oxychloride concentrations (1260.0 ppm, 126.0 ppm, 12.6 ppm, 1.26 ppm, 0.126 ppm and 0.00 ppm of the active ingredient). The concentration of 0.00 ppm represents the control without addition of the fungicide and 1260.0 represented the recommended field... |
