Resumo -O objetivo deste trabalho foi avaliar o efeito de extratos de capeba (Piper marginatum) e nim (Azadirachta indica) sobre o fungo Colletotrichum scovillei e determinar o componente mais ativo no controle pós-colheita da antracnose em pimentão. A atividade de extratos metanólicos das folhas (P. marginatum e A. indica) e das sementes (A. indica) a 0, 125, 250, 500, 1.000 e 2.000 ppm, na inibição do crescimento micelial de C. scovillei in vitro foram avaliadas. O extrato metanólico de folhas de P. marginatum foi o mais ativo e, consequentemente, foi submetido ao fracionamento biomonitorado ("bioassay-guided fractionation"). Esse processo rendeu 10 frações majoritárias, obtidas por cromatografia líquida de alta performance, das quais a fração à concentração de 1,5 ppm inibiu o desenvolvimento de C. scovillei de forma mais eficiente do que o fungicida mancozeb.Termos para indexação: Capsicum annuum, antracnose, controle alternativo, fracionamento biomonitorado, nim. Extracts of Piper marginatum and Azadirachta indica for the control of Colletotrichum scovillei in bell pepperAbstract -The objective of this work was to evaluate the effect of extracts of capeba (Piper marginatum) and neem (Azadirachta indica) on the fungus Colletotrichum scovillei, and evaluate the most active compound on the post-harvest control of anthracnose in bell pepper. Methanolic extracts activity of leaves (P. marginatum and A. indica) and of seeds (A. indica) at 0, 125, 250, 500, 1,000, and 2,000 ppm, for in vitro inhibition of mycelial growth of C. scovillei, were evaluated. The methanolic extract of P. marginatum leaves was the most active and, consequently, it was subjected to a bioassay-guided fractionation. This processing produced ten major compounds, obtained by preparative HPLC, from which the fraction at 1.5 ppm concentration was capable of inhibiting mycelial growth and was more effective than the fungicide mancozeb.
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