Characterization of Fusarium spp. causal agent of wilt in pecan

One of the limiting factors for pecan production is incidence disease caused by Fusarium spp. which are a threat to orchards in south country. Therefore, study aimed confirm pathogenicity and evaluate morphophysiological molecular characteristics associated with Rio Grande do Sul Paraná. For this, samples symptomatic plant material were collected, potentially pathogenic isolates evaluated pathogenicity, immersing roots plants spore suspension In addition, severity was assessed using rating scale according symptoms expressed plants. The also analyzed variability, through evaluations mycelial growth, colony aerial mycelium pigmentation, reproductive structures. Molecular characterization performed amplify region 1-alpha elongation factor sequencing. Nineteen obtained, considered pathogenic, however, there variability their aggressiveness characteristics. sequencing used identify different species. species responsible occurrence wilt southern Brazil.