Experiments for the evaluation of soybean resistance to anthracnose were carried out at Federal University of Santa Maria. Six cultivars were selected based on their reaction to the pathogen inoculation (two resistant, two intermediate and two susceptible), and submitted for inoculation in stadiums V1/V2 and V5/V6. Plant reactions were determined from symptom severity scale (zero to nine), and used to determine the virulence and resistance indexes. The results of inoculation in stages V1/V2 showed differences in the reaction of cultivars when compared to the inoculations carried out in stage V5/V6. High resistance in V5/V6 suggests a mechanism of "resistance of adult plant".
Anthracnose; Glycine max; adult plant
