The weed biotypes resistant to herbicides in the Brazilian and worldwide agriculture is a phenomenon reported for most of the herbicides in use in the agriculture. The confirmation of a new case of weed resistant to glyphosate by the species Lolium multiflorum that correspond to the first case in Brazil for this herbicide, leave the weed scientist, producers and industrial media concerned due to the importance of this herbicide for weed management in several crops. Therefore, the discussion and understanding of the resistance phenomenon is fundamental to delay or avoid the selection herbicide resistant weed biotypes, being this the main objective of this article. It is discussed aspects related to factors related to the weeds and cropping systems that interact in the selection of herbicide resistance, the potential of weed resistant to glyphosate, gene flow, and ways to delay or avoid resistance.
gene flow; lolium; resistance avoidance; resistance management
