What is a recommended control measure for gray leaf spot?

The recommended control measure for gray leaf spot is to maintain high cutting heights and mow frequently. This approach is effective because taller grass blades can promote better airflow and reduce humidity levels within the turf, which directly counters the conditions that favor the development of gray leaf spot disease. Additionally, mowing at higher heights allows the turf to develop a more robust root system and greater resilience to stress, which can help it fend off disease pressures.

In contrast, water management strategies, such as watering heavily during the day, might actually create conditions that lead to increased disease susceptibility rather than alleviating it. This practice can lead to prolonged leaf wetness and higher humidity around the grass, both of which encourage the spread of pathogens.

While applying fungicides can be a part of disease management, the recommendation to apply them bi-weekly without regard to the symptoms doesn't take into account the need for targeted treatments based on observed disease presence. This could lead to unnecessary chemical applications and potential resistance issues.

Therefore, the approach of maintaining high cutting heights and frequent mowing aligns best with the cultural control measures needed to manage gray leaf spot effectively.