Efeito da forma de aplicação e de doses de tiofanato-metílico + fluazinam e fluopyram para o controle de Pratylenchus brachyurus em soja

Abstract

In Brazil, the nematode of radical injuries is a big problem to the soybean culture that lives together with various phytosanitary problems. The Pratylenchus brachyurus is one the main important phytonemotoids to the soybean culture that may cause economic damages to the rural producers. Mato Grosso is one of the states that are most affected by P. brachyurus, a nematoid of difficult control, because there are no resistant soybean cultivars, as well as having affinity with various plant species. Therefore, the use of chemical products becomes an alternative to the control of this phytonemotoid. There are some nematicides on the market that have a good level of control for this nemotoid. The aim was to evaluate and compare two chemical products with five doses and two forms of application: via seed treatment and via planting furrow for the control of P. brachyurus. The experiment was conducted inside the UFMT’s vegetation house of Campus Araguaia in Barra do Garças-MT. The products used were Certeza N® (Thiophanate methyl + Fluazinam) and Ilevo® (Fluopyram). The treatments were control (0 dose) and doses of 1, 2, 3 and 4 ml/kg of seeds for the two products (Certeza N® and Ilevo® ), with five replications. Phytotoxicity evaluations were carried out at 7 and 14 days after emergence, and after 60 days of the experiment, evaluations were carried out to measure the height of the aerial part, weigh the mass of the fresh and dry aerial part, and of the roots, the amount of the P. brachyurus population in the soil and in the roots, extracted by the methods of Jenkins (1976) and Coolen and D'Herde (1972), respectively. A reduction in the population of P. brachyurus was observed in the roots with the application of Fluopyram, and it was possible to observe a greater weight in the roots and aerial dry part with the form of application via the planting furrow. Fluopyram and the furrow application method were therefore, more efficient.