Eficácia de formulações e doses de fluensulfone em tratamento de sementes de soja para o controle de Heterodera glycines

Abstract

One of the main strategies of integrated management of nematodes is, besides the use of resistant cultivars, crop rotation. ). Seed treatment would be an ideal strategy for the control and prevention of nematodes. Therefore, the present work had as objective to verify the selectivity and efficacy of new formulations of fluensulfone in treatment of soybean seeds in greenhouse for the control of Heteroderaglycines. The experiment was installed in a randomized complete block design (DBC). Six different nematicides were used in the treatment of seeds, and different dosages were used, totaling 21 chemical treatments and one untreated control. The inoculation was performed 11 days after sowing with the first trefoil, the inoculum was from an area with soybean infested by H.glycine (Ichinohe). The evaluation occurred 35 days after the inoculation, which consisted of weighing the root system - disregarding the shoot - and then processing the roots. A reduction in the female Heteroderaglycines index was observed in the soybean roots when treated with fluensulfone at the dosages of 25, 50 and 70 g ai / 100 kg of soybean seeds. The treatment of Israel 22230/38 at the dose of 25 g ai, showed the lowest number of nematodes in the roots. The rates of females obtained in the product Israel 22230/38, at the dosages of 25 g ia (T4), 35 g ia (T9), 50 (T14 ) And 70 g ia (T19) were 12.9; 27.4; 30.1 and 48.9, respectively. The treatment 22 (avicta) obtained little efficiency in the control of females of H. glycines in soybean according to the index of females. No tested product was classified as efficient, according to the index of females, but the Avicta was not very efficient and Israel 22230/38 (25g ia) and Israel 22230/38 (70g ia) had the best and the worst efficiency of the present work , Respectively.