Controle de alternaria em sementes de cenoura: tratamentos alternativos

Abstract

The future perspective of vegetable agribusiness in the world is timely, the growing participation of international market expansion opportunity in the domestic market. Within this context, there have been problems associated with the germination of carrot seeds as a result of fungal contamination. Therefore, the hypothesis of this study is that carrot seeds can be influenced in the germination process by presenting fungal contamination and surface disinfected with different treatments, they can promote better performance in germination and seed vigor. Considering the above, the present study was to evaluate the surface disinfection with alcohol and sodium hypochlorite, via seed treatment for the control of Alternaria spp. and the physiological performance of carrot seeds. The study was conducted at the Seed Analysis Laboratory Didactic Dr. Flavio Rocha FAEM-UFPel, at the Seed Pathology Laboratory and flower beds filled with sand. The factors studied in the experiment were: method of filter paper; germination; first count; Accelerated aging; cold test without soil; Emergency field and shoot length and root. The experimental design was completely randomized in a factorial arrangement AxB (Factor A: hypochlorite and alcohol, and Factor B: time (hypochlorite - 0 min, 2.5 min, 5.0 min, 7.5 min and 10.0 min) and (alcohol - 0 sec, 10 sec, 20 sec, 30 sec, 40 sec and 50 sec), with four replications. It follows that the use of 70% alcohol and 1% hypochlorite solution for surface disinfection of the seeds does not alter the physiological quality of carrot seeds. Moreover, both solutions are effective to reduce the infestation of seeds with Alternaria spp. For alcohol, a better sterilization is obtained after 30 seconds of immersion. 1% hypochlorite for seven minutes immersion is needed to better asepsis.