What is the general term for living organisms that cause disease in turfgrass?

The term that refers to living organisms that cause disease in turfgrass is "pathogens." Pathogens include a wide range of infectious agents such as fungi, bacteria, viruses, and nematodes that can lead to various diseases affecting the health and growth of turfgrass. Understanding pathogens is crucial for proper lawn management, as they can lead to symptoms such as discoloration, wilting, and die-off of grass. Identifying these agents early can help in implementing effective control measures to protect turfgrass and maintain its vitality.

While parasites and weeds may negatively impact turfgrass, they don't primarily fit the definition of organisms causing disease. Parasites might consume plant material but aren’t specifically known for inducing disease symptoms in the traditional sense. Weeds compete with turfgrass for resources but aren't classified as disease-causing organisms. Vectors typically refer to organisms that transport pathogens from one host to another rather than being the pathogens themselves. Thus, the focus on pathogens underscores their direct role in causing turfgrass diseases, making it the most accurate term in this context.