Certified Crop Advisor Practice Exam

Biological control agents that work best are typically characterized as?

1. Indigenous to the area

2. Not indigenous to the crop or area

3. Highly toxic

4. Fast multiplying

The correct answer is: Not indigenous to the crop or area

Biological control agents that work best are typically characterized as being indigenous to the area. Utilizing native species enhances the effectiveness of biological control because these agents are often well-adapted to local environmental conditions and the specific pests they are targeting. Indigenous organisms have evolved alongside the local pest populations and ecosystems, which generally allows for a more balanced and sustainable interaction. Choosing an indigenous agent can lead to better establishment and persistence in the environment, as these organisms are already part of the existing ecological framework. They are more likely to integrate successfully with other native species and can help maintain the natural balance of the ecosystem. In contrast, non-indigenous agents may face challenges when introduced into a new environment, including competition with established species or difficulty in adapting to local conditions. This can limit their efficacy as biological control agents. Highly toxic agents pose environmental and health risks, making them less desirable as a biological control option. Fast-multiplying agents might sound appealing; however, if their rapid multiplication is not matched by their effectiveness in controlling pests, or if it disrupts the local ecosystem, it may not be advantageous in the long term.