MECANISMOS DA RESISTÊNCIA MÚLTIPLA DA Conyza sumatrensis A HERBICIDAS

Abstract

Agriculture plays a fundamental role in the Brazilian economy, driven by technological advances that aim to increase productivity in a sustainable manner and ensure the competitiveness of the agricultural sector. However, weed management represents one of the greatest challenges in agriculture, characterized by highly adaptable non-cultivated plants that establish themselves in production areas. The use of herbicides is widely adopted as a control method because of its high efficiency. However, repeated use of a single mechanism of action favors the selection pressure of resistant biotypes. In Brazil, pigweed (Conyza spp.) stands out as one of the main resistant genera, with the species C. sumatrensis exhibiting multiple resistance to five mechanisms of action. The study was based on scientific literature using available studies on the resistance mechanisms of C. sumatrensis associated with the various mechanisms of action of herbicides, with the aim of gathering, analyzing, and discussing information on the biological behavior of the species and alternatives for controlling resistant populations. It was concluded that C. sumatrensis has complex resistance mechanisms that, linked to biological characteristics, make isolated control difficult.