Which of the following allows for effective control of gray leaf spot?

Improving air circulation in the lawn is effective for controlling gray leaf spot because this fungal disease thrives in warm, humid environments with poor airflow. When air circulation is enhanced, the moisture on the grass blades dries more quickly, reducing humidity levels and limiting the favorable conditions for the fungus to develop and spread. This practice can help prevent the disease from establishing itself and can also assist in controlling its severity if it is already present.

In contrast, high nitrogen fertilization can potentially increase the growth of the grass, which may inadvertently create a denser canopy that holds more moisture and can worsen the conditions for gray leaf spot. Frequent watering during afternoons is also problematic because it can lead to increased humidity and prolonged leaf wetness, creating an environment conducive to the fungus. Low mowing height might stress the grass and make it more susceptible to disease by exposing more of the plant to pathogens and reducing its overall vigor. Therefore, enhancing air circulation stands out as a practical and effective strategy for mitigating gray leaf spot in turfgrass.