Control químico de patógenos fungosos en piña (Ananas comosus (L.) Merrill) de vivero (II)

In order to determine the efficacy of a fungicide group on some plant pathogenic fungi that affect the cultivation of pineapple in field nurseries, a test was conducted in randomized blocks, with stems fractions of the variety Smooth Cayenne Serrana, disinfected by immersion in solution of 10 L by 10 minutes, with the active ingredients 1-1 propamocarb at doses of 1.04 g/L a.i. alone and 0.78 g/L a.i. in mixtures with triazols; triadimenol at 0.5 g/L a.i.; propiconazole, tebuconazole, hexaconazol a rate of 0.05 g/L a.i. alone and in mixtures with 1-1 propamocarb to 0.375 g/L a.i., besides metiran 3 g/L a.i. Phytophthora nicotianae, Fusarium subglutinans and Chalara pardoxa were isolated during the experiment, which showed the presence of agents causing diseases of economic importance in crop. It was found that triadimenol (0.5 g/L a.i.) and the mixture 1-1 propamocarb+triadimenol (0.78 + 0.375 g/L a.i.) offer good control levels on these fungal pathogens with efficiency of 76.2 and 80.9%, respectively; both treatme0nts showed significant differences to other variants tested and the control without applications and provided protection for 30 days.