What is a key characteristic of weed resistance?

A key characteristic of weed resistance is that weeds evolve adaptations to survive chemicals. This means that when herbicides are applied, certain weeds may have genetic variations that allow them to withstand the effects of these chemicals. Over time, the selective pressure from repeated herbicide applications can lead to the dominant presence of these resistant individuals in the weed population. This evolution can result in reduced effectiveness of herbicides, making management more challenging for turf and ornamental professionals.

The other options do not accurately describe weed resistance. Weeds may not become less common with herbicide use if resistance develops, as resistant populations can proliferate. Additionally, weeds do not stop reproducing; in fact, resistant populations can reproduce and spread their traits. The notion that weeds grow faster in the presence of herbicides is also misleading, as resistance refers to their ability to survive rather than a change in growth rate. Thus, the concept of adaptation and survival in response to chemical pressures is central to understanding weed resistance.