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Phoma leaf spot, caused by Phoma costarricensis poses a serious threat to coffee (Coffea arabica) production, especially in the highlands of the state of Minas Gerais, Brazil. Extracts of citric biomass, coffee berry husks and coffee leaves severely affected by rust caused by Hemileia vastatrix, were evaluated against P. costarricensis. In an in vitro assay, aqueous extracts of rusted leaves and berry husks plus the commercial extracts based on citric biomass named Ecolife® and Agromil® were tested at various dilutions on the mycelial growth inhibition of P. costarricensis. In vivo, coffee seedlings maintained in glasshouse, were sprayed with these extracts seven days before inoculation of P. costarricensis. Only extracts from citric biomass had inhibitory effects on the fungus. In vivo, Ecolife® (5 ml/l), Agromil® (5 g/l) and the aqueous extract of rusted coffee leaves (dilution 1:6) reduced Phoma leaf spot. Both, Ecolife® and the extract of rusted coffee leaves were significantly more effective in reducing the area under the lesion progress curve when applied at lower doses, indicating a possible effect on the induction of resistance. A mancha-de-Phoma, causada por Phoma costarricensis é uma séria ameaça a produção de café (Coffea arabica), especialmente nas terras altas do estado de Minas Gerais, Brasil. Extratos de biomassa cítrica, extratos de casca de café e de folhas de café severamente afetadas pela ferrugem (Hemileia vastatrix), foram avaliados contra P. costarricensis. Em um ensaio in vitro, o extrato aquoso de folhas com ferrugem e de casca de frutos, além dos extratos comerciais baseados em biomassa cítrica, chamados Ecolife® e Agromil®, foram testados em várias diluições sobre o crescimento micelial de P. costarricensis. In vivo, mudas de café mantidas em casa de vegetação foram pulverizadas com esses produtos, sete dias antes da inoculação com P. costarricensis. Somente os extratos baseados em biomassa cítrica tiveram efeito inibitório sobre o fungo. In vivo, Ecolife® (5 ml/l), Agromil® (5 g/l) e o extrato aquoso de folhas com ferrugem (diluição 1:6) reduziram a mancha-de-Phoma. Ambos, Ecolife® e o extrato de folhas de café com ferrugem foram significativamente mais eficazes em reduzir a área abaixo da curva de progresso da lesão, quando utilizados nas menores dosagens, o que é um indicativo de indução de resistência

Effect of extracts from citric biomass, rusted coffee leaves and coffee berry husks on Phoma costarricencis of coffee plants