Combinações de fungicida, fosfito e silicato de potássio no manejo da ferrugem da folha do trigo

Abstract

The objective of this study was to evaluate the effect of the combination of fungicide, phosphite and potassium silicate, applied route leaf, in the management of wheat leaf rust (Puccinia triticina), and effects on productivity characters. The experiment was conducted in the experimental area of the Federal University of Pampa, Campus Itaqui-RS in the 2018 harvest, in a randomized complete block design with ten treatments and four replications. The treatments were: Witness; Fungicide + Fungicide; Phosphite + Phosphite; Silicate + Silicate; Fungicide + Phosphite; Fungicide + Silicate; Phosphite + Fungicide; Silicate + Fungicide; Phosphite + Silicate; Silicate + Phosphite, performing the first application at the beginning of stem elongation, and the second, 15 days after. The severity of the rust was evaluated weekly in twenty plants per plot, analyzing the flag leaf and whole plant. Severity data determined the area below the disease progress curve (AACPD). The productivity characteristics evaluated were: dry matter, number of ears per meter, spike weight, number of grains per spike, weight of grains per spike, weight of a thousand grains, weight of hectoliter and productivity. Data were submitted to analysis of variance by the F test and the means of the treatments, grouped by the Scott-Knott test at 5% probability. The phosphite + fungicide treatment presents effective control of the disease, providing an increase in productivity. The different combinations of phosphite and potassium silicate are not efficient in the control of wheat leaf rust.