REDUÇÃO DE FUNGOS E QUALIDADE FISIOLÓGICA DE SEMENTES DE MILHO INOCULADAS COM Trichoderma harzianum

Corn (Zea mays L.) is affected by a multitude of diseases, causing great damage and losses in production. Thus, seed treatment is essential to ensure good productivity with higher yields. The objective of the research was to evaluate the effect of Trichoderma harzianum on the sanitary and physiological quality of corn seeds. Maize seeds, originating from the municipalities of Sumé (lot 1), Monteiro (lot 2) and Prata (lot 3) were subjected to ten treatments, consisting of T1 = control (no treatment), T2 = dicarboximide fungicide (24 g. kg-1 of seeds), T3 = 0.50; T4 = 1; T5 = 1.5; T6 = 2; T7 = 2.5; T8 = 3; T9 = 3.5 and T10 = 4 g of T. harzianum. kg-1 of seeds. The seed health test (Blotter test) was carried out in order to evaluate the presence of pathogens and the physiological aspects were determined by seed germination and vigor. The use of T. harzianum, regardless of the concentration applied to corn seeds, was effective in reducing Aspergillus sp.; A. niger; Penicillium sp. and Fusarium sp. T. harzianum did not negatively affect the physiological quality of seeds and provided an increase in germination percentages.O milho (Zea mays L.) é acometido por uma infinidade de doenças, causando grandes danos e prejuízos na produção. Sendo assim, o tratamento de sementes é imprescindível para garantir uma boa produtividade com maiores rendimentos. O objetivo da pesquisa foi avaliar o efeito do Trichoderma harzianum na qualidade sanitária e fisiológica em sementes de milho. As sementes de milho, originadas dos municípios de Sumé (lote 1), Monteiro (lote 2) e Prata (lote 3) foram submetidas a dez tratamentos, constituídos de T1 = testemunha (sem tratamento), T2 = fungicida dicarboximida (24 g. kg-1 de sementes), T3 = 0,5; T4 = 1; T5 = 1,5; T6 = 2; T7 = 2,5; T8 = 3; T9 = 3,5 e T10 = 4 g do T. harzianum. kg-1 de sementes. Foi realizado o teste de sanidade de sementes (Blotter test) a fim de avaliar a presença de patógenos e os aspectos fisiológicos foram determinados pela germinação e vigor das sementes. O uso de T. harzianum independente da concentração aplicada nas sementes de milho foram eficazes na redução de Aspergillus sp.; A. niger; Penicillium sp. e Fusarium sp. O T. harzianum não interferiu negativamente na qualidade fisiológica das sementes e proporcionou um aumento nos percentuais de germinação. Palavras-chave: controle biológico; milho; patologia de sementes. Fungi reduction and physiological quality of corn seeds inoculated with Trichoderma harzianum ABSTRACT: Corn (Zea mays L.) is affected by a multitude of diseases, causing great damage and losses in production. Thus, seed treatment is essential to ensure good productivity with higher yields. The objective of the research was to evaluate the effect of Trichoderma harzianum on the sanitary and physiological quality of corn seeds. Maize seeds, originating from the municipalities of Sumé (lot 1), Monteiro (lot 2) and Prata (lot 3) were subjected to ten treatments, consisting of T1 = control (no treatment), T2 = dicarboximide fungicide (24 g. kg-1 of seeds), T3 = 0.50; T4 = 1; T5 = 1.5; T6 = 2; T7 = 2.5; T8 = 3; T9 = 3.5 and T10 = 4 g of T. harzianum. kg-1 of seeds. The seed health test (Blotter test) was carried out in order to evaluate the presence of pathogens and the physiological aspects were determined by seed germination and vigor. The use of T. harzianum, regardless of the concentration applied to corn seeds, was effective in reducing Aspergillus sp.; A. niger; Penicillium sp. and Fusarium sp. T. harzianum did not negatively affect the physiological quality of seeds and provided an increase in germination percentages. Keywords: biological control; corn; seed pathology