Assessment of severity and incidence of powdery mildew in clusters of PIWI varieties and selections in São Joaquim, SC
DOI:
https://doi.org/10.52945/rac.v38i2.1892Keywords:
Erysiphe necator, Precipitation, Resistant varieties, altitudeAbstract
Powdery mildew (Erysiphe necator) is one of the most serious and destructive diseases of grapes around the world and its occurrence has increased in the region of São Joaquim/SC. Although the application of chemical fungicides is the most common control method, using resistant varieties may be the most effective and environmentally sound strategy for managing the disease. This study aimed to characterize the incidence and severity of powdery mildew on grapevine clusters of nine varieties and two fungal disease-resistant selections (PIWI) in São Joaquim, SC, during the vintage 2020. The varieties studied were Aromera, Bronner, Felicia, Helios, Calardis Blanc, GF.2004-043-0024, GF.2004-043-0015 (white), Regent, Prior, Calandro and Baron (red). The incidence and severity of powdery mildew were evaluated in the vintage 2020. To investigate the impact of powdery mildew on the agronomic performance of the varieties, the cluster weight, number of berries per cluster, berry diameter, pH, soluble solids content and total acidity were analyzed in seasons 2019 (without natural occurrence of powdery mildew) and 2020 (with natural occurrence of powdery mildew). The varieties most affected by powdery mildew were Felicia, Bronner and Regent, which presented average susceptibility and incidence between 40 and 50%. The varieties that presented the lowest incidence and severity of powdery mildew were Baron, Prior, Calandro and Aromera. On average, the grapes produced in the vintage 2020 (with the occurrence of powdery mildew) presented lighter clusters, fewer berries per cluster and berries of smaller diameter compared to the grapes produced in 2019. Regardless of the vintage and occurrence of powdery mildew, all varieties produced grapes with ripening rates suitable for making quality wines.
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Copyright (c) 2025 Isadora Malohlava, Fabio Ribeiro de Freitas, Emilio Brighenti, Felipe Augusto Moretti Ferreira Pinto, André Luiz Kullkamp de Souza, Alberto Fontanella Brighenti
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