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The capacity of two bacteria isolated from the tomato phylloplane to control late blight (Phytophthora infestans) was investigated in the field, and compared against the effectiveness of spraying with the fungicide chlorothalonil (1.5 g a.i. L-1) or water (control). A 55% reduction in late blight intensity was observed in the leaves of the middle of the plant and 62% in those of the upper leaves when using the antagonist UFV-STB 6 (Novosphingobium capsulatum) as compared to the control. Isolate UFV-IEA 6 (Bacillus cereus) was able to reduce disease intensity by 55%, but only in the upper leaves of the tomato plants. Treatment with isolate UFV-STB 6 also led to a significant reduction in the percentage of fruits with late blight symptoms. The results demonstrate the potential of these two bacteria in controlling this disease. A capacidade de dois isolados bacterianos obtidos do filoplano de tomateiro, em controlar a requeima (Phytophthora infestans) em condições de campo, foi comparada com o fungicida chlorothalonil (1,5 g l-1) e água (controle). Foi observada uma redução de 55% na intensidade da doença em folhas da do terço mediano da planta e de 62% nas folhas superiores, quando pulverizadas com o antagonista UFV-STB 6 (Novosphingobium capsulatum) em relação ao tratamento controle. O isolado UFV-IEA 6 (Bacillus cereus) foi capaz de reduzir a intensidade da doença em 55%, somente nas folhas do terço superior das plantas. As plantas pulverizadas com o isolado UFV-STB 6 também apresentaram redução significativa no percentual de frutos sintomáticos. Os resultados demonstram que os dois isolados bacterianos têm potencial no controle da doença

Efficiency of phylloplane bacteria in controlling aerial tomato diseases under field conditions