RESUMOO presente trabalho objetivou avaliar a eficácia da ulvana, um polissacarídeo proveniente de alga, em induzir resistência em Phaseolus vulgaris contra Colletotrichum lindemuthianum, quando formulada sozinha ou com caulinita, sílica amorfa ou atapulgita e armazenada por 0, 4, 8 ou 12 meses. Após cada período de armazenamento, as formulações e água (controle) foram aplicadas à folhagem de plantas de feijão (cv. Uirapuru, estádio fenológico V 4 ) aos 6 e 3 dias antes da inoculação com C. lindemuthianum. A severidade da antracnose foi estimada em intervalos de 2 dias, com o aparecimento dos primeiros sintomas até 13 dias após a inoculação. A partir dos dados de severidade calculou-se a Área Abaixo da Curva de Progresso da Doença (AACPD). A aplicação de ulvana (controle) ou de suas formulações com sílica amorfa ou caulinita, promoveu uma redução de cerca de 45% na severidade da antracnose. A eficiência da ulvana em controlar a antracnose foi mantida nas formulações com sílica amorfa ou caulinita, mas não naquela contendo atapulgita, durante o período de 12 meses. Palavras-chave: Antracnose, atapulgita, caulinita, feijão, sílica amorfa, ulvana. ABSTRACT Effectiveness of formulas based on ulvan in inducing resistance in Phaseolus vulgaris against Colletotrichum lindemuthianumThe present work aimed to evaluate the effectiveness of ulvan, an algal polysaccharide, in inducing resistance of Phaseolus vulgaris against Colletotrichum lindemuthianum when formulated alone or with kaolinite, amorphous silica or attapulgite, and stored for 0, 4, 8, or 12 months. Following each storage period, the formulations and a water control were applied to the foliage of bean plants (cv. Uirapuru, growth stage V 4 ) at 6 days, and again at 3 days, before the foliage was inoculated with C. lindemuthianum. Anthracnose severity was estimated at intervals of 2 days, beginning when the first symptoms appeared and continuing until 13 days after inoculation. The severity data were used to calculate values for Area Under the Disease Progress Curve (AUDPC). The application of ulvan (control) or its formulations with amorphous silica or kaolinite reduced anthracnose severity by 45%. The efficiency of ulvan in controlling anthracnose was maintained throughout 12 months of storage when it was formulated with amorphous silica or kaolinite, but not with attapulgite.
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