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Diferentes formulações de fungicidas cúpricos, cloretos de benzalcônio e de composto bioativo líquido foram testados para o controle da seca dos ponteiros causada por Erwinia psidii em goiabeira (Psidium guajava), observando-se os possíveis efeitos fitotóxicos. O experimento foi conduzido em pomar comercial de goiabeira das variedades Pedro Sato e Comum, no município de Brazlândia, DF. Os tratamentos constaram dos seguintes produtos/L de água: 5,0 g de sulfato de cobre (SC), 3,5 g de oxicloreto de cobre (OC), 3,0 g de hidróxido de cobre (HC), 3,0 mL de cloretos de benzalcônio (CB) e 20,0 mL de composto bioativo líquido (CBL). A fitotoxicidade foi avaliada em botões florais e frutos, em três estádios de desenvolvimento, e a incidência da doença, em 10 ramos de frutificação em cada quadrante da planta nos mesmos estádios. Na variedade Pedro Sato, em frutos de tamanho inferior a 15 mm não foram observados sintomas severos de fitotoxicidade, no entanto, na variedade Comum foi possível observar sintomas severos ocasionados pelos cúpricos; em frutos entre 16 e 30 mm e acima de 31 mm, em ambas as variedades, foram observados sintomas moderados a severos, ocasionados principalmente pelo SC. No controle da doença, os tratamentos com SC, OC, HC e CBL foram mais eficientes na variedade Pedro Sato, enquanto o CBL foi mais eficiente na variedade Comum. Em ambas as variedades o CBL mostrou menor Área Abaixo da Curva de Progresso da Doença (AACPD).  ABSTRACTDifferent formulations of cupric fungicides, benzalconium chlorides and liquid bioactive compost were tested to observe their phytotoxicity in guava fruits (Psidium guajava) and control of bacterial blight caused by Erwinia psidii. The experiment was carried out in a commercial guava orchard with "Pedro Sato" and "Comum" varieties in Brazlândia, DF. The treatments were comprised of the following products/L of water: 5.0 g copper sulphate (SC); 3.5 g copper oxychloride (OC); 3.0 g copper hydroxide (HC); 3.0 mL benzalconium chlorides (CB); 20.0 mL liquid bioactive compost (CBL). Phytotoxicity was evaluated in flower buds and three stages of fruit development; disease incidence was evaluated in the same treatments, on 10 fruit-bearing branches in each quadrant of the plant. In the Pedro Sato variety, in fruits smaller than 15 mm in diameter, a few slight symptoms of phytotoxicity was observed, while in the Comum variety some severe symptoms caused by copper were observed. In fruits of both varieties between 16 and 30 mm and larger than 31 mm, moderate to severe symptoms were observed, mainly induced by the SC. In the control of the disease, the treatments with SC, OC, HC and CBL were more efficient in the Pedro Sato variety, while CBL was most efficient in Comum. In both treatments CBL showed a smaller area under disease progress curve (AUDPC)

tropical plant pathology

Fungicidas cúpricos, cloretos de benzalcônio e composto bioativo liquído (Bokashi): fitotoxicidade e controle da seca dos ponteiros causada por Erwinia psidii em goiabeiras