Avaliação de manchas em grãos de amendoim produzidos sob epidemia severa de mancha anelar

The ring spot is a virus caused by species of the Tospovirus genus, it can also cause spots on peanut grains. Information on symptoms in grains is scarce in Brazil. Because of this, the objective was to evaluate stains on peanut grains produced under high severity of ring stain. 26 lines and the cultivar BRS 423 OL, developed by the Embrapa Peanut Breeding Program, were evaluated in the 2019/20 harvest in Tupa-SP, under a severe ring spot epidemic. Each plot had two lines with three meters in length spaced 0.90 m between lines. The plots were inverted at 122 days after sowing. Four samples of 200 grams of each genotype were collected, in a completely randomized design, and the grains stained with ring stain symptoms (presence of irregular stains, redness, cracks in the films and deformations in the grains) and healthy grains were identified to determine the mass and the percentage of spotted grains. The strain 18-2131 OL had the lowest mass and the lowest percentage of spotted grains (20.1%); strains 19-2584 OL, 18-2136 OL, 18-2042 OL and 18-2250 OL showed less than 30% of spots; the BRS 423 OL cultivar showed less than 32% of grain stain. The identification of genotypes with less symptoms in the grains is important for the development of peanut cultivars with better grain quality.