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Fitopatologia Brasileira

Print version ISSN 0100-4158

Abstract

SPONHOLZ, Claudia et al. Thermotherapy of banana 'Prata' to control post-harvest anthracnose. Fitopatol. bras. [online]. 2004, vol.29, n.5, pp. 480-485. ISSN 0100-4158.  http://dx.doi.org/10.1590/S0100-41582004000500002.

This study was done to determine the efficacy of hydrotherapy and some fungicides to control banana (Musa spp.) anthracnose caused by Colletotrichum musae and their effect on the color development in banana fruits of cultivar 'Prata'. Bunches of banana were sprayed with the conidial suspension (2.5 x 106 /ml ) of the pathogen and 24 h later were immersed for 0, 10, 15 or 20 min in hot water at 45 ºC, 50 ºC or 53 ºC. Another group of inoculated bunches was immersed for three min in the suspension of tebuconazole, procloraz, difenoconazole or propiconazole at the concentrations of 0, 62.5, 100, 125 or 250 mg.l-1. After 12 days of storage, the disease incidence was only one fruit per bunch treated for 20 min at 45 ºC, while treatment for less time periods were inefficient. The lesioned area was reduced to 15% when fruits were treated for 20 min at 50 ºC, but to 3% or 0% if treated for 15 or 20 minute at 53 ºC, respectively compared to 53% in the non-treated fruits. The fungicides procloraz and propiconazole at a concentration of 100 mg.l-1 and 250 mg.l-1, respectively, were most efficient for disease control, since the fruits remained healthy even after 15-day storage, while the non treated fruits developed 60% lesioned areas. On the other hand, the lesioned area varied from 1 to 3% after 12-day storage of fruits treated with tebuconazole (250 mg.l-1), procloraz (62,5 mg.l-1) or propiconazole (62.5 mg.l-1). Difenoconazole did not control the disease.

Keywords : Musa spp.; Colletotrichum musae; fungicidas; controle químico; hidroterapia; tratamento térmico.

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