Ornamental and Turf Pesticide Applicators Practice Exam

What is a characteristic of Pythium blight?

1. Irregular dark patches

2. Round to irregular spots

3. Thin yellow streaks

4. Bumpy textures on grass

The correct answer is: Round to irregular spots

Pythium blight is characterized by its distinct round to irregular spots, which can be one of the most observable signs of this turfgrass disease. These spots typically appear as water-soaked lesions on the leaves and often seem as if they are melting. As the disease progresses, the affected areas can give way to larger patches that may merge, exhibiting a grayish-brown color that can also be associated with the presence of mycelium. In contrast, the other options describe characteristics that are not typical of Pythium blight. Irregular dark patches may relate to different turf diseases, while thin yellow streaks and bumpy textures on grass are indicative of other issues or diseases altogether. Understanding these specific characteristics of Pythium blight is crucial for proper identification and management strategies in turfgrass care.