Sensibilidad in vitro de dos especies de Sclerotinia spp. y Sclerotium cepivorum a agentes de control biológico y fungicidas In vitro sensitivity of two species of Sclerotinia spp. and Sclerotium cepivorum to agents of biological control and fungicides

The in vitro response of two Sclerotinia minor-, five S. sclerotiorum- and two Sclerotium cepivorum-isolates to 16 biological control agents and eight fungicides was evaluated. A split plot experimental design was used, with a factorial arrangement correction for each pathogen. Factor A corresponded to fungi isolates and Factor B to control agents. The comparison of means was carried out using a Tukey test (P<0.05), having 11 evaluations every 24 h of the Mycelial radial growth rates (Mrgr). In any case no effect was found, alone or in interactions with control agents. Dicloran, Benomyl, Tebuconazole and Cyprodinil- Fludioxonil inhibited the mycelial growth of all fungi with a final average of 1.0 Mrgr, and in greater proportion than biological agents (BA). The BA that propitiated the lesser mycelial growth towards S. minor were: Microorganisms (BPG- Plus), Trichoderma sp. (Trichoderma), T. viride (Esporalis) and Bacillus subtillis (Serenade max); with isolates of S. sclerotiorum, Trichoderma sp. (Trichoderma), Trichoderma harzianum (Natucontrol), Microorganisms (BPG-Plus) and T.