Proposta de um procedimento para a redução da contaminação fúngica de Fusarium guttiforme em mudas de abacaxi ‘pérola’

Abstract

The major problem tied to pineapple, especially the cultivar Pérola is the susceptibility to fusariosis, the main fungal disease that affects pineapples. Aiming to combat the dissemination of the fungus Fusarium guttiform in 'Pérola' pineapple seedlings in a non-aggressive way, in the present work were used alternative methods, Ultraviolet (UV) radiation, sanitization with 1% sodium hypochlorite and ozonization. In partnership with the Minas Gerais Agricultural Company - EPAMIG located in the city of Uberaba, state of Minas Gerais (MG), 910 'Pérola' pineapple seedlings were collected from the filhote type contaminated with fusariosis for testing, with 270 seedlings for use of treatment with Ultraviolet Radiation (UV), 320 seedlings for the treatment with Sodium Hypochlorite 1% and 320 seedlings for Ozonization treatment. The seedlings were selected in Aparecida de Minas, district of the city of Frutal - MG, where the producers of family agriculture of the fruit are located. Spread Plate counting technique, microscopic evaluation was used to quantify microorganisms and after treatment, seedlings were planted to verify their development. At the end of the analysis, the method using Sodium Hypochlorite 1% was the most indicated. Which presented a 98,2% reduction in CFU / g in the T4 treatment, expressed a 42,5% increase in plant growth in the T2 treatment (time of 1 minute, administering 6,8 ml of NaOCl in 34 liters of drinking water). And pointed out a 62,3% reduction in plant mortality, however in the T4 treatment, which was prepared in 15 minutes, applying 20,4 ml of NaOCl in 34 liters of drinking water.