Performance de Oomicidas no Controle da Requeima no Tomate Industrial

Abstract

Late blight, caused by Phytophthora infestans, is one of the most destructive diseases in processing tomato production in Brazil, demanding effective phytosanitary management strategies. This study evaluated the efficacy of different oomycide formulations, with emphasis on the combination oxathiapiprolin + azoxystrobin, in the control of late blight in tomato. The field experiment was carried out in a randomized block design with six treatments and four replications: T1 – Control; T2 and T3 – oxathiapiprolin + azoxystrobin at doses of 0.8 L/ha and 1.0 L/ha, respectively; T4 – Dimethomorph (0.7 kg/ha); T5 – Benthiavalicarb + Chlorothalonil (0.7 kg/ha); and T6 – Propamocarb + Fluopicolide (1.25 L/ha). Applications were performed according to a fixed schedule, with weekly evaluations of the number of infected leaflets. Results indicated that treatments T2 (0.8 L/ha) and T3 (1.0 L/ha) with oxathiapiprolin + azoxystrobin showed the best performance, significantly reducing the area under the disease progress curve (AUDPC) and providing the highest increases in yield and industrial performance, especially T2. These findings confirm the agronomic and economic efficiency of this formulation, highlighting its relevance as a sustainable management tool against late blight, and contributing to the protection of tomato crops under tropical conditions with high disease pressure.