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O objetivo deste trabalho foi avaliar a reação de dez cultivares de morangueiro ao oídio (Sphaerotheca macularis f.sp. fragariae). Plantas-matrizes foram transplantadas em bandejas de 72 células, contendo substrato autoclavado. Em seguida, bandejas com plantas de morangueiro severamente infestadas com oídio foram colocadas na casa de vegetação. Utilizou-se do delineamento experimental de blocos casualizados, com parcelas subdivididas e quatro repetições, contendo dez plantas. As parcelas foram constituídas de dez cultivares de morangueiro (Aromas, Bürkley, Camarosa, Campinas, Dover, Milsei-Tudla, Oso Grande, Santa Clara, Sweet Charlie e Vila Nova) e as subparcelas de três épocas de avaliação da severidade da doença nas três folhas mais novas totalmente expandidas (8ª, 10ª e 12ª semana após o transplantio das plantas-matrizes). Utilizou-se de uma escala de notas, onde 0; 1; 2 e 3 representaram, respectivamente, 0%, 1-25%, 26-50% e > 51% de área foliar coberta com estruturas do fungo. A severidade da doença diminuiu com a proximidade do verão, devido às maiores temperaturas médias diárias. Verificou-se alta variabilidade das cultivares quanto à reação ao oídio, sendo: 'Milsei-Tudla' altamente resistente; 'Camarosa', 'Aromas', 'Oso Grande', 'Sweet Charlie' e 'Campinas' medianamente resistentes; 'Dover' pouco resistente; e 'Bürkley', 'Vila Nova' e 'Santa Clara' altamente suscetíveis. The aim of this work was to evaluate the reaction of ten strawberry cultivars to powdery mildew (Sphaerotheca macularis f.sp. fragariae). Mother plants were transplanted into autoclaved substrate in trays with 72 cells. The disease inoculation was done by placing plants severely infested with powdery mildew in the greenhouse. The experimental design was a randomized block with split plot and four replications with ten plants. The cultivars tested were Aromas, Bürkley, Camarosa, Campinas, Dover, Milsei-Tudla, Oso Grande, Santa Clara, Sweet Charlie and Vila Nova. The disease severity was evaluated in the youngest 3 leaves during three periods: 8th, 10th and 12th week after transplanting. A rating scale was used, in which 0, 1, 2 and 3 represented 0%, 1-25%, 26-50%, and > 51% of leaf surface covered with fungal structures, respectively. The disease severity reduced with the proximity of the summer, because of higher daily average temperature. High variability to powdery mildew resistance among the cultivars was verified. 'Milsei-Tudla' showed high resistance. 'Camarosa', 'Aromas', 'Oso Grande', 'Sweet Charlie' and 'Campinas' exhibited average resistance. 'Dover' showed little resistance and 'Bürkley', 'Vila Nova' and 'Santa Clara' were highly susceptible

Reação de cultivares de morangueiro ao oídio sob condições de casa de vegetação