Weeds control and selectivity of tembotrione herbicide in the corn culture

Abstract

With the aim of evaluate the efficiency and the selectivity of the tembotrione herbicide, isolated and complemented with atrazine, in the weeds control of the corn culture, an experiment was installed at the UEPG School Farm, in the 2004/05 agricultural year. The experimental design was a complete randomized blocks with nine treatments and four repetitions. The treatments consisted of the postemergence application of Equip Plus (foransulfuron & iodosulfuron methyl sodium) - 0,12 L ha-1 complemented with Atrazinax (atrazine) - 2 L ha-1 and Hoefix (adjuvant) - 1,0 L ha-1; Sanson (nicosulfuron) - 0,60 L ha-1 complemented with Atrazinax - 2,0 L ha-1; Callisto (mesotrione) - 0,30 L ha-1 complemented with Primóleo (atrazine) - 3,0 L ha- 1 ; Soberan (tembotrione) - 0,18 and 0,24 L ha-1 complemented with Atrazinax - 2 L ha-1 and added of Aureo (metilado oil of soy) - 1,0 L ha-1; Soberan (tembotrione) - 0,24 and 0,30 L ha-1 added of Aureo (metilado oil of soy) - 1,0 L ha-1; with and without weeding. The used hybrid was DKB-215. Soberan complemented with Atrazinax is efficient in the control for Brachiaria plantaginea, Digitaria horizontalis e Bidens pilosa , with similar results to Callisto + Atrazinax and equal or superior results to Equip Plus and Sanson + Atrazinax. When applied isolated Soberan it showed equal result for the grassy ones, however, for Bidens pilosa the control was efficient, but inferior to some treatments; Soberan in the biggest rate and with Atrazinax after promoted light symptoms of fitotoxicity up to 14 days its application, such which the mixture of Equip Plus and Sanson + Atrazinax.