Efeito de fungicidas no controle in vitro de Colletotrichum gloeosporioides, agente etiológico da antracnose do mamoeiro (Carica papaya l.)

Abstract

The efficiency of fungicides on Colletotrichum gloeosporioides was evaluated in vitro in the Laboratory of Epidemiology and Diseases Management of the Department of Phytopathology /UFLA. The fungicides were applied either in BDA medium or in glass slide chambers, the latter to assess the effects on conidial germination. The fungicides tested were: azoxystrobin, chlorothalonil, sodium hypochloride, imazalil, copper oxychloride, prochloraz, propiconazol, tebuconazol, thiabendazol and thiophanate-methyl in the concentrations of 0, 1, 10, 100, 500 and 1.000 ppm to evaluate the inhibition of the mycelial growth and in the concentrations of 0, 1, 10, 50 and 100 ppm to test inhibition of the conidial germination. The fungicides azoxystrobin, chlorotalonil, imazalil, prochloraz, propiconazol and tebuconazol presented high efficiency in the inhibition of the mycelial growth. The fungicides of the benzimidazol group (thiabendazol and thiophanate-methyl) showed low efficiency in the control of C. gloeosporioides. Sodium hypochloride showed low efficiency in the control of the mycelial growth of the fungus. For inhibition of the conidial germination, the fungicides oxychloride, chlorothalonil and sodium hypochloride showed high efficiency, even at low concentrations. C. gloeosporioides showed to be tolerant to the fungicides thiabendazole and thiophanate-methyl, as conidial germination and mycelial growth were not affected in the presence of these products.