Silicato e fosfito de potássio no controle de brusone no arroz

Abstract

Many diseases attack the culture of irrigated rice, contributing to the reduction of productivity and grain quality. Among the main diseases of the crop, it is highlighted the blast, which occurs throughout the Brazilian territory and is considered the most destructive rice disease. The development of alternative technologies for sustainable blast control has been studied with the aim of reducing the environmental impacts caused by chemical control and reducing production costs. Among the most used technologies, the use of resistance inductors such as silicates and phosphites can be highlighted. The objective of this work was to evaluate the effect of phosphite and potassium silicate on leaf blast control in irrigated rice. The experiment was conducted in the experimental area of the Federal University of Pampa - Unipampa / Itaqui Campus. The experimental design was in randomized blocks, with five treatments and four blocks. The treatments consisted of Bim® 750 BR, Reforce®, Supa Silica®, Yantra® and control, without application of products. After the applications were made, the evaluations were done every seven days of the disease with a descriptive scale of notes. Ten plants were randomly sampled from each plot, thus evaluating the severity of the disease in the flag leaf. Fungicide use is the most effective treatment for bladder control. Potassium phosphites, Yantra and Reforce reduce the severity of the blast in rice. The treatments tested did not influence grain yield and weight. Potassium phosphites become important alternatives for sustainable management of blast control, and other studies should be carried out to obtain more results on the use of these products.