EFICÁCIA DE DIFERENTES FUNGICIDAS APLICADAS NO TRATAMENTO DE SEMENTES PARA O CONTROLE DE Phomopsis sojae NA CULTURA DA SOJA

Abstract

In order to evaluate the efficiency of different fungicides applied via seed treatment to control Phomopsis soye (Dry stem and pods) in soybean culture, an experiment was carried out on the Rancho Velho farm, in the municipality of Montividiu, GO. The test was conducted under field conditions under no-tillage system, consisting of 07 (seven) treatments and 04 (four) repetitions, in a randomized block design, totaling 28 plots of 2 m x 4 m each. The commercial fungicides Maxim XL, Maxim Advanced, Rancona T, Standak Top, and Certeza were tested, and these treatments were compared to an inoculated control treatment and another non-inoculated control treatment. All seeds were inoculated with the pathogen, except for the non-inoculated control, and then received, when appropriate, industrial treatment of the seeds with the fungicides in the laboratory of Corteva Agriscience. The crop was planted on 12/18/2019. Phytotoxicity assessments were performed at 7 and 14 days after plant emergence (DAE), with scores on the scale of 0-100%. The stand evaluations were carried out at 7, 14, 21 and 28 DAE, counting the number of plants in 8 linear meters (two central lines). The harvest was carried out on 04/06/2020. The plant stand was protected by the fungicide treatments used. The productivity was numerically higher where fungicide treatments were used, when compared to the inoculated control. It is possible to conclude that in situations of attack of the pathogen, fungicide treatments via seed treatment are efficient in controlling Phomopsis soy and soybean culture, providing protection of the stand and productivity superior to the inoculated control treatment, and that no symptoms of phytotoxicity were observed, and the treatments are considered safe for the crop.