What is a potential consequence of using pesticides improperly?

Using pesticides improperly can lead to resistance development among pest populations. When pesticides are overused, misapplied, or applied at incorrect times, pests can be exposed to the chemicals in a way that allows some individuals to survive and reproduce. Over time, these surviving pests can develop genetic resistance to the active ingredients in the pesticides. This means that the same products will become less effective, leading to a cycle where higher amounts of pesticide must be used to achieve the same level of pest control, further exacerbating the problem.

In contrast, the other options do not reflect the consequences of improper pesticide use. Improved crop resistance to pests typically results from proper management practices and breeding efforts rather than from pesticide misuse. Enhanced soil fertility is generally not linked to pesticide applications; in fact, improper pesticide application can sometimes harm beneficial soil organisms. Lastly, reduced insect visibility in fields may result from effective management or pest control, but not from improper pesticide use, which could lead to unexpected pest outbreaks instead.