Weed Control J 2022; 21: e202200773
Use of herbicides to control regrowth plants of Euphorbia heterophylla (L.)
DOI: 10.7824/wcj.2022;21:00773
Abstract
Background
The control of mature weeds in agriculture demands higher costs and more complex management strategies than the treatment of younger plants. This control is more difficult on regrowth weeds with morphologic, physiologic, and biochemical characteristics that provide higher tolerance.
Objective
This study aims to evaluate the control efficiency of different herbicides and associations, in different doses, on regrowth plants of Euphorbia heterophylla (L.) after the cultivation of common beans in a second harvest.
Methods
The experiment was conducted in the fall the 2020 under field conditions in a randomized block design with four replications of thirteen treatments: control (without herbicide); glyphosate (868 and 1736 g ha -1 ); metsulfuron (1.2 and 2.4 g ha -1 ); 2.4-D (335 and 670 g ha -1 ); metsulfuron + 2.4-D (1.2 + 335 g ha -1 and 2.4 + 670 g ha -1 ); iodosulfuron (1.75 and 3.5 g ha -1 ); triclopyr (48 and 96 g ha- 1 ). Thirty-five days after the herbicide application, the following characteristics were evaluated: phytotoxicity, plant height, number of seeds per plant, and dry mass.
Results
The results demonstrate that the use of glyphosate in both doses tested provides adequate control of regrowth plants of E. heterophylla .
Conclusions
The use of metsulfuron + 2.4-D (2.4+670 g ha -1 ) stands out as an efficient alternative to control E. heterophylla when it is not possible the use of full action herbicides, demonstrating high control efficacy (94%) and reduction of dry mass (89%).
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