Resumo

PEREZ-MORENO, Luis et al. In vitro sensitivity of two species of Sclerotinia spp. and Sclerotium cepivorum to agents of biological control and fungicides. Rev. mex. fitopatol [online]. 2015, vol.33, n.2, pp.256-267. ISSN 2007-8080.

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), Trichodermasp. (Trichoderma), T. viride(Esporalis) and Bacillus subtillis (Serenade max); with isolates of S. sclerotiorum, Trichodermasp. (Trichoderma), Trichoderma harzianum (Natucontrol), Microorganisms (BPG-Plus) and T. harzianum (Biotricho-H), with a Mrgr of 1.48, 1.56, 2.35 and 2.53, respectively. For S. cepivorum, the best management was obtained with Trichodermasp. (Trichoderma), T. viride (Esporalis), T. harzianum(Natucontrol) and Microorganisms (BPG-plus), with a Mrgr of 1.03, 1.73, 2.55 and 2.70, respectively. In summary, Thichoderma sp. and Microorganisms were the most consistents in their ability to inhibit the three pathogens.

Palavras-chave : Vegetables; soil borne fungi; biofungicides; chemical control.

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