Ornamental and Turf Pesticide Applicators Practice Exam

Large patch, also known as Rhizoctonia solani, commonly appears in turfs such as zoysiagrass and bermudagrass as large, circular areas of dead or dying grass. These patches often range from 1 to 5 feet in diameter but can also exhibit thin edges, which may extend beyond that range, creating an appearance of thinner, irregular patches. This characteristic is crucial for identification as it signifies the disease's impact on the grass in a way that is distinct from other turf diseases, which may manifest differently.

The other options do not accurately describe the typical appearance of large patch. For instance, large, uniform patches indicate a more consistent and even spread, whereas large patch displays irregularity in size. Small, isolated spots suggest a less widespread issue, contradicting the expansive nature of large patch. Extended lines of discoloration may be indicative of other turf diseases but are not typical for large patch, where the dead grass tends to form more circular patterns instead. Understanding these characteristics helps in identifying and managing turf diseases effectively.