Herbicide drift over horticultural crops is a common problem in the state of Rio Grande do Sul, mainly in areas near rice, soybean and corn fields. The objective of this research was to evaluate glyphosate and clomazone drift effects on beetroot (Beta vulgaris) and carrot (Daucus carota) plants. The herbicides were sprayed at three different growth stages: 20, 30 and 40 days after seedling emergence. Herbicide rates evaluated were 0, 5, 10, 15, and 20% of the label rate. The sprayed rates were 0, 63, 126, 189 and 252 g ha-1 of glyphosate and 0.0, 14.4, 28.8, 43.2 and 57.6 g ha-1 of clomazone. Glyphosate injury to beetroot and carrot increased with herbicide rate, with the highest injury being observed at the earlier growth stage. Clomazone did not injure beetroot and carrot plants at any tested rate or growth stage. The results of this study suggest that glyphosate drift damages beetroot and carrot at any growth stage. However, beetroot and carrot are not sensitive to clomazone drift.
herbicide; crop injury; vegetables
