Estrobilurina e triazol associados a fungicidas protetores para o controle da mancha branca

Abstract

Corn culture in Brazil has long been considered a rustic crop and disease management was not a concern. Especially since the 90s, there was an increase in the incidence and severity of some fungal leaf diseases, causing a qualitative and quantitative reduction in production. One of the main diseases that affect culture is the white spot complex. The objective of this work was to evaluate the efficacy of different fungicides, composed of strobilurin + triazole and protectors to control the white spot of corn. The experiment was conducted in the first harvest of the 2019/2020 agricultural year, in the municipality of Uberlândia - MG. The experimental design was carried out in randomized blocks, with nine treatments and five replications, one control treatment and the others composed of different combinations of Priori Xtra®, Fusion® EC, Unizeb® Gold and Approve® fungicides. The characteristics evaluated in the test were plant height, ear insertion height, final plant stand, disease severity, area under the disease progress curve (AACPD), green leaf area and productivity. The treatments did not differ for plant height, ear insertion height and final plant stand. All treatments with fungicides were superior to the control regarding AACPD, percentage of green leaf area and productivity. The best averages were obtained by treatments that contained protective fungicides in their composition. The addition of phenylpyridinylamine + benzimidazole or dithiocarbamate to the mixture of strobilurin + triazole in V8, VT and R2 or VT and R2, and also only the mixture of phenylpyridinylamine + benzimidazole applied in V8, VT and R2 are effective in controlling the white spot.