Which of the following is a potential consequence of improper pesticide use?

Improper pesticide use can lead to environmental contamination, which is a significant concern in pest management practices. When pesticides are not applied according to label instructions, they can drift from the target area, leach into the soil, or runoff into nearby waterways. This contamination can harm non-target species, disrupt ecosystems, and pose health risks to humans and wildlife. Additionally, residues may persist in the environment, leading to long-term ecological impacts.

The other options presented suggest beneficial outcomes in plant growth, pest resistance, and crop yield, which could occur with appropriate pesticide use but are unlikely results of improper application. These benefits are not features of misuse; instead, they can be impeded by environmental damage and reduced efficacy when pesticides are misapplied.