What is a common outcome of using pesticides improperly?

Using pesticides improperly often leads to the development of pesticide resistance. When pesticides are applied inappropriately—such as using them in excessive amounts, applying them too frequently, or using them against the wrong pests—there can be selective pressure on pest populations. This means that the pests that happen to have some resistance to the pesticide will survive and reproduce, passing those resistant traits to their offspring. Over time, this can result in a population of pests that is significantly harder to control with the same pesticides, ultimately making pest management more difficult and requiring the use of stronger or more toxic chemicals.

Other options like increased crop yield or improved insect health do not typically result from improper pesticide use. Instead, improper use can lead to negative consequences for crop health and non-target insect populations, including beneficial insects. Additionally, while there might be some reduction of pests initially, it is usually not sustainable, and populations can rebound, especially if resistance develops. Thus, the outcome of pesticide resistance is a significant and well-documented consequence of misuse.