What is a disadvantage of using pesticides for pest control?

Using pesticides for pest control can lead to pest resistance, which is a significant disadvantage. This occurs when pests develop adaptations that render them less susceptible to the chemicals intended to eliminate them. As a result, over time, the effectiveness of certain pesticides diminishes, requiring higher doses or alternative products to achieve the same level of pest control. This resistance can create a cycle where pest populations become harder to manage, ultimately leading to increased costs and environmental concerns as more potent or harmful chemicals are sought after.

In contrast, the other options do not portray accurate characteristics of pesticides. Safety precautions are always necessary when handling pesticides, as they can pose health risks to humans, pets, and non-target organisms. Not all pesticides are non-toxic; many are designed to kill pests and can be harmful to humans and the environment. Additionally, while some pesticides may have immediate effects, not all do, as some are designed for residual effects that may last longer. Therefore, the aspect of developing resistance is a critical concern within integrated pest management strategies.