Germinação, sanidade e tratamento de sementes de Guazuma ulmifolia Lam.

Abstract

The objective of this study was to characterize the germination, to determine the sanity evaluation method and to verify the action of the treatment of the mutamba seeds with the use of essential oils and commercial fungicide. We worked with two sources (Berilo-MG and Montes Claros-MG). The experiments were carried out in a completely randomized and 4 repetitions. The germination of seeds treated with concentrated sulfuric acid was evaluated for 50 minutes and immersion in hot water (60°C for 16 minutes) to overcome dormancy. The test was performed according to the Rules of Analysis of Seeds, in factorial 2x2 (2 provenances and 2 methods of overcoming numbness). The sanity was evaluated by Blotter test and BDA medium. For the control of fungi the treatments were tested: carboxin 2% + tiram 2%; Cymbopogon nardus oil; Lippia sidoides (5 and 10 μl / ml); sodium hypochlorite 2%; witness). Data analysis was by statistical software R, and averages compared by the Scott-Knott test at 5%. The seeds of Berilo-MG show higher germination than those of Montes Claros, after treatment with sulfuric acid. The Blotter test method detects a greater diversity of fungi being the main ones, Aspergillus and Penicillium. Although the commercial fungicide showed superiority in reducing the fungal contamination of Guazuma ulmifolia (99%) seeds, treatment with citronella at a concentration of 10 μl / mL showed a good reduction potential (63%), requiring tests with new concentrations of the product and evaluation of its effect on the germination and performance of the mutamba seeds.