Manejo químico de espécies de trapoeraba com aplicação isolada e em mistura de diferentes herbicidas

Abstract

This paper evaluated the effect of different herbicides applied isolated and mixed on two species of dayflower (Commelina benghalensis and Commelina villosa). Both species were grown under pot conditions with a capacity of 14 L. Three stems with 10 cm were planted per pot. The herbicides application was made using a stationary spray system, to provide a spray volume of 200 L ha -1, with spray tip XR 110.02VS, when the plants were with dimensions of 25-35 cm for C. benghalensis and 30-35 cm for C. villosa. The mixture saflufenacil more effective control of C. benghalensis were saflufenacil + glyphosate (48 + 720 g ha -1) and, saflufenacil + (glyphosate + imazethapyr) with and without the addition of ammonium sulfate (24 + 623 g ha -1). The combination of carfentrazone + glyphosate (20 + 720 g ha -1) were also effective in the C. benghalensis control. The saflufenacil mixture allowed plant control of C. villosa, where saflufenacil + glyphosate (24 + 720 g ha -1) with the addition of ammonium sulfate, showed a good visually control of this species. The application of 2,4-D (720 g ha -1) and 2,4-D + glyphosate (720 + 720 g ha -1) provided the best visual controls of C. benghalensis e C. villosa. All chemical treatment regardless of Commelina species reduced the dry mass of dayflower.