The aim of this work was to evaluate the control efficacy of diquat, glyphosate, and imazapyr and the anatomic leaf blade changes caused by these herbicides in B. subquadripara. The plants were grown in reservoirs under field conditions, and, after reaching the full vegetative development stage, were sprayed with solutions of diquat at 400 g ha'¹ , glyphosate at 4,320 g ha'¹combined with Aterbane at 0.5% v v¹, and imazapyr at 750 g ha'¹ . A control without herbicide was used. Control evaluations were carried out, followed by evaluation of the anatomic quantitative characteristics of the central vein and intervein regions of the leaf blade, as well as of the stem region: adaxial and abaxial epidermis %, endoderm %, vascular bundle %, aerenchyma lacunas %, parenchyma and leafthickness %, epidermal stem %, and vascular cambium and stem diameter %. The herbicides diquat and imazapyr promoted the largest number of changes in the quantitative anatomic characters of the midrib and intervein regions of the leaf and stem regions of the plants. However, with the exception of diquat, the herbicides were effective in controlling the B. subquadripara plants. All the herbicides allowed plant re-growth.
leaf anatomy; aquatic plant; weed; chemical control
