Which cultural management practice is suggested to combat Dollar Spot?

The practice of avoiding light, frequent watering is suggested to combat Dollar Spot because this disease thrives in conditions of high moisture on the turfgrass. Dollar Spot is primarily caused by the fungus Sclerotinia homeocarpa, which prefers environments that are damp, particularly when grass leaves remain wet for extended periods.

By preventing light watering, and instead opting for less frequent but deeper watering sessions, you can reduce the humidity level around the grass blades and the amount of free water that the fungus needs to infect the turf. This approach promotes a healthier root system as well, allowing the turf to be more resilient against disease pressures.

In contrast, increasing nitrogen fertilization may actually encourage the rapid growth of grass, which could, paradoxically, create conditions that are favorable for Dollar Spot if not managed properly. Mowing at a very low height can stress the grass and expose it to a higher risk of disease by allowing more moisture retention. Frequent aeration, while beneficial for overall soil health and oxygen flow, does not specifically address the moisture issues that foster the growth of Dollar Spot. Therefore, the recommended practice emphasizes proper watering techniques to create a less favorable environment for the fungus.