Abstract
Background
Amaranthus hybridus, a common agricultural weed in Brazil, has been associated with complications in the management of major crops. Recently, A. hybridus biotypes with suspected resistance to the herbicide glyphosate have been observed in the state of Paraná.
Objective
To characterize glyphosate-resistant Amaranthus hybridus biotypes.
Methods
Three independent experiments were conducted to evaluate four biotypes of A. hybridus. Twelve doses of glyphosate were applied, including 64D, 32D, 16D, 8D, 4D, 2D, D, 1/2D, 1/4D, 1/8D, 1/16D, and a control with no herbicide. The dose D of glyphosate applied was 1080 g ha-1 ae. Four replicates for each treatment and a randomized block design were used. At 28 (DAA), the control (%) and residual dry mass of each plot were analyzed.
Results
The biotypes with suspected resistance (R1, R2, and R3) had a GR50 in the range of 3019.13 to 3316.45 g ha-1 ae and LD50 in the range of 4081.52 to 4310.29 g ha-1 ae whereas the susceptible biotype had a GR50 of 227.63 g ha-1 ae and LD50 of 196.59 g ha-1 ae.
Conclusions
Biotypes R1, R2, and R3 are resistant to the herbicide glyphosate.
Susceptibility; Smooth pigweed; Dose-response; Herbicide resistance
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