Associate Certified Entomologist (ACE) Practice Exam

Which organism is an example of a microbial used for pest control?

1. Aspergillus niger

2. Bacillus thuringiensis

3. Escherichia coli

4. Pseudomonas syringae

The correct answer is: Bacillus thuringiensis

Bacillus thuringiensis is widely recognized as a microbial agent used in pest control. It is a naturally occurring bacterium that produces proteins toxic to certain insect larvae, particularly those of moths and butterflies. When ingested by these pests, the proteins disrupt their digestive systems, effectively controlling their populations without the use of chemical insecticides. This specific use makes Bacillus thuringiensis an important tool in integrated pest management strategies, promoting environmentally-friendly practices while effectively targeting harmful insects. The specificity of its action means that it typically has a minimal impact on beneficial insects and other non-target organisms, which is a significant advantage compared to traditional chemical methods. In contrast, the other organisms listed do not serve as effective biological control agents for pest management in the same way. Aspergillus niger is a fungus primarily known for its role in food production and biodegradation. Escherichia coli is a bacterium that is commonly found in the intestines of humans and animals, often associated with food safety issues rather than pest control. Pseudomonas syringae is a plant pathogen that can cause disease in plants rather than serve as a control agent for insect pests. Therefore, Bacillus thuringiensis is the clear choice for a microbial