Ornamental and Turf Pesticide Applicators Practice Exam

Which factor is NOT a component of the disease pyramid?

1. Host

2. Pathogen

3. Environment

4. Fungicide

The correct answer is: Fungicide

The disease pyramid is a conceptual model used to understand the interactions between various components that contribute to the occurrence of plant diseases. It is structured around three primary factors: the host (the plant), the pathogen (the organism that causes disease), and the environment (the conditions that influence the interaction between the host and pathogen). A fungicide, while it can play an important role in managing plant diseases, is considered a means of control rather than a fundamental component of the disease interaction itself. It does not fit into the core model of the disease pyramid, which focuses on the biological and environmental factors that allow disease to occur. By understanding the disease pyramid, practitioners can better assess risks and develop management strategies that focus on host resistance, pathogen control, and modification of environmental conditions to reduce disease incidence. Thus, choosing fungicide emphasizes an intervention rather than an inherent aspect of the disease process.