The use of fungicides in agriculture, especially when inadequate, has caused damages to both the environment and humans. The present study aimed to investigate in vitro the efficacy of extracts of three plants and two basidiomycetes of the Brazilian flora in controlling Alternaria solani and Colletotrichum acutatum, which causes serious damages to tomato and strawberry crops, respectively, and Sclerotium rolfsii, considered as non-specific pathogen. This work evaluated: a) mycelial growth inhibition for the three phytopathogens, b) conidial germination inhibition (A. solani and C. acutatum) and c) sclerotial germination inhibition for S. rolfsii. The best results were obtained with Oudemansiella canarii extract, which provided the lowest mycelial growth values for the three pathogens, besides totally inhibiting A. solani and C. acutatum conidial germination and S. rolfsii sclerotial germination. I. lacteus extract partially inhibited the mycelial growth of the pathogens and Avicennia schaueriana promoted only 16% inhibition in S. rolfsii mycelial growth. Senna spectabilis and Senna multijuga extracts had no effect on the pathogens under the conditions of the present experiments.
Avicennia schaueriana; Senna spectabilis; Senna multijuga; Irpex lacteus; Oudemansiella canarii; natural products
