Ornamental and Turf Pesticide Applicators Practice Exam

What are the visible symptoms of Pythium blight on closely mowed turf?

1. Irregular green patches

2. Small brown circles

3. Spots ranging from 1 inch in diameter

4. Dark streaks on blades

The correct answer is: Spots ranging from 1 inch in diameter

Pythium blight is a common turf disease that manifests in distinctive ways. One of the hallmark symptoms of Pythium blight in closely mowed turf is the appearance of spots that range from about 1 inch in diameter. These spots typically appear water-soaked, greasy, or have a soft texture and can be found clustered together in the turf. This characteristic is critical as it helps distinguish Pythium blight from other turf diseases. While irregular green patches, small brown circles, and dark streaks on blades may be indicative of other issues affecting turf health, they do not specifically describe the unique signs associated with Pythium blight. Moreover, they may represent different conditions or diseases that have alternative treatments or management practices. Understanding the specific symptoms associated with Pythium blight allows for effective identification and management, which is vital for maintaining the health of turfgrass in ornamental and landscape applications.