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Two biological control agents, Bacillus subtilis AP-01 (LarminarTM) and Trichoderma harzianum AP-001 (TrisanTM) alone or/in combination were investigated in controlling three tobacco diseases, including bacterial wilt (Ralstonia solanacearum), damping-off (Pythium aphanidermatum), and frogeye leaf spot (Cercospora nicotiana). Tests were performed in greenhouse by soil sterilization prior to inoculation of the pathogens. Bacterial-wilt and damping off pathogens were drenched first and followed with the biological control agents and for comparison purposes, two chemical fungicides. But for frogeye leaf spot, which is an airborne fungus, a spraying procedure for every treatment including a chemical fungicide was applied instead of drenching. Results showed that neither B. subtilis AP-01 nor T. harzianum AP-001 alone could control the bacterial wilt, but when combined, their controlling capabilities were as effective as a chemical treatment. These results were also similar for damping-off disease when used in combination. In addition, the combined B. subtilis AP-01 and T. harzianum AP-001 resulted in a good frogeye leaf spot control, which was not significantly different from the chemical treatment. Dois agentes de controle biológico, Bacillus subtilis AP-01 (Larminar®) e Trichoderma harzianum AP-001 (Trisan®) foram avaliados separadamente ou em combinação quanto à capacidade de controlar três doenças do tabaco: murcha bacteriana (bacterial wilt, Ralstonia solanacearum), tombamento de mudas (damping-off, Pythium aphanidermatum), e mancha olho-de-rã (frogeye leaf spot, Cercospora nicotiana). Os testes foram realizados em estufa, esterilizando-se o solo antes da inoculação dos patógenos. Os patógenos causadores da murcha bacteriana e tombamento de mudas foram inicialmente encharcados e acompanhados com os agentes de controle biológico e, para comparação, com um fungicida químico. Para a mancha olho-de-rã, causada por um fungo anemófilo, utilizou-se um processo de spray ao invés do encharcamento. Os resultados indicaram que nenhum dos dois agentes de controle biológico, aplicado isoladamente, foi capaz de controlar a murcha bacteriana, mas quando em combinação a capacidade de controle foi similar ao do tratamento químico. Resultados semelhantes foram obtidos para o tombamento de mudas. Além disso, a combinação de Bacillus subtilis AP-01 e Trichoderma harzianum AP-001 resultou em um controle muito eficiente da mancha olho-de-rã, que não diferiu significativamente daquele obtido com o tratamento químico

Greenhouse evaluation of Bacillus subtilis AP-01 and Trichoderma harzianum AP-001 in controlling tobacco diseases