Mode of Action and Resistance Management
Arylex™ active is a synthetic auxin herbicide active ingredient that acts through a synthetic auxin mechanism. With Arylex, farmers have an alternative auxinic herbicide mode of action to manage weed biotypes that are resistant to other herbicides. Since the late 1940s, synthetic auxin herbicides have offered farmers an effective mode of action to manage difficult-to-control weeds; as the newest member of this family, Arylex™ active is no exception.
Arylex molecules are metabolized to the active form after absorption by the leaves and (to a lesser extent) the roots, then are translocated throughout the plant, collecting at the growing points. Inside the plant’s cells, Arylex mimics naturally occurring hormones by binding with specific auxin receptors in the cell’s nucleus. The affinity of Arylex to bind with specific receptors differentiates it from other synthetic auxin herbicides.
Binding of Arylex with these auxin receptors triggers the degradation of “repressor” proteins that normally stabilize auxin regulated genes in the cell nucleus. Without the repressor proteins in place, the auxin-regulated genes “switch-on," inducing a cascade of unregulated growth in susceptible plants within minutes after application. This leads to profound long-lasting physiological and morphological effects on susceptible weeds that stop plant growth and eventual death in susceptible plants.