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The use of organic matter that improves the physical, chemical and biological soil properties has been studied as an inducer of suppressiveness to soilborne plant pathogens. The objective of this work was to evaluate the effect of different sources and concentrations of organic matter on tomato bacterial wilt control. Two commercially available organic composts and freshly cut aerial parts of pigeon pea (Cajanus cajan) and crotalaria (Crotalaria juncea) were incorporated, in concentrations of 10, 20 and 30 % (v/v), into soil infested with Ralstonia solanacearum. The soil with the fresh organic matter of pigeon pea and crotalaria was incubated for 30 and 60 days before planting. Tomato seedlings of cv. Santa Clara were transplanted into polyethylene bags with 3 kg of the planting substrate (infested soil + organic matter). The wilting symptoms and percentage of flowering plants were evaluated for 45 days. All evaluated concentrations with incorporation and incubation for 30 days of aerial parts of pigeon pea and crotalaria controlled 100% tomato bacterial wilt. With 60 days of incubation, only the 10 % concentration of pigeon pea and crotalaria did not control the disease. These results suggest that soil incorporation of fresh aerial parts of pigeon pea and crotalaria is an effective method for bacterial wilt control. A utilização de materiais orgânicos que melhoram as características físicas, químicas e biológicas do solo vem sendo estudada como indutora de supressividade a fitopatógenos habitantes do solo. Este trabalho teve como objetivo avaliar o efeito de diferentes fontes e concentrações de matéria orgânica no controle da murcha bacteriana do tomateiro. Foram avaliados dois compostos orgânicos comerciais e a matéria fresca cortada da parte aérea de guandu (Cajanus cajan) e de crotalária (Crotalaria juncea), nas concentrações 10, 20 e 30 % (v/v), incorporados no solo infestado com Ralstonia solanacearum. O solo que recebeu a parte aérea de guandu e crotalária foi incubado por 30 e 60 dias, antes do plantio. Mudas de tomateiro 'Santa Clara' foram transplantadas para sacos de polietileno contendo 3 kg de substrato (solo infestado + matéria orgânica) e avaliou-se, por um período de 45 dias, o sintoma de murcha bacteriana e a percentagem de plantas com floração. A incorporação e incubação por 30 dias com guandu e crotalária promoveu 100 % de controle da murcha, em todas as concentrações avaliadas. Com 60 dias de incubação, apenas a concentração de 10 % de guandu e crotalária não controlou a doença. Esses resultados indicam que a incorporação no solo com a parte aérea de guandu e crotalária é um método eficiente para o controle da murcha bacteriana do tomateiro

Control of tomato bacterial wilt through the incorporation of aerial part of pigeon pea and crotalaria to soil