Associate Certified Entomologist (ACE) Practice Exam

Which of the following is a potential consequence of using broad-spectrum insecticides?

1. Reduction of pest populations only

2. Impact on non-target organisms

3. Increased pest resistance

4. Both b and c

The correct answer is: Both b and c

Using broad-spectrum insecticides can lead to significant ecological consequences, notably impacting non-target organisms and contributing to increased pest resistance. When broad-spectrum insecticides are applied, they do not discriminate between target pests and beneficial organisms. This indiscriminate action can reduce populations of beneficial insects such as pollinators and natural pest predators, disrupting the local ecosystem and potentially harming agricultural productivity in the long run. This is a critical consideration in integrated pest management, where preserving beneficial organisms is vital for sustainable pest control. Additionally, the widespread use of these insecticides can lead to pest resistance. When a broad-spectrum insecticide is used frequently, the pests that survive exposure may develop resistance to that chemical, resulting in a population that is increasingly hard to control. This cycle can create a reliance on ever-stronger chemicals, ultimately leading to more significant environmental and economic challenges. Thus, both the impact on non-target organisms and the increased pest resistance reflect the broader consequences of using broad-spectrum insecticides, making the combined answer the most comprehensive and accurate response.