Associate Certified Entomologist (ACE) Practice Exam

Which of the following statements is true about microbials?

1. They are synthetic chemicals only.

2. They have a possible mode of action involving natural pathogens.

3. They are used solely as pesticides.

4. They are ineffective against adult pests.

The correct answer is: They have a possible mode of action involving natural pathogens.

Microbials refer to microorganisms, particularly those that can be used in pest management, such as bacteria, fungi, viruses, and other natural organisms. The statement that they have a possible mode of action involving natural pathogens is true because microbials can act as pathogens that target specific pest species. This natural approach helps maintain ecological balance and reduces the reliance on synthetic chemicals. In contrast to other statements, microbials are not limited to synthetic chemicals, as they are fundamentally biological in nature. Furthermore, while they can be used as pesticides, they are not used solely for that purpose; they can also have roles in other applications, such as biocontrol within ecosystem management. Additionally, microbials can be effective against various life stages of pests, including larvae and adult forms, depending on the specific microbial agent used and its mode of action. This versatility is an important advantage in pest management strategies.