How does excessive thatch affect turfgrass health?

Excessive thatch negatively impacts turfgrass health primarily by increasing disease susceptibility. Thatch is a layer of organic matter, including dead grass blades, stems, and roots, that accumulates between the soil surface and the grass blades. When the thatch layer becomes too thick, it can create a favorable environment for diseases. The moisture trapped within the thatch can lead to fungal growth, while the matting can restrict air circulation around the grass. This lack of air movement, coupled with high moisture levels, significantly raises the risk of turf diseases such as dollar spot and brown patch.

Furthermore, a thick thatch layer can inhibit the grass's root systems from growing deep into the soil, making them more susceptible to stress and disease. Proper maintenance practices are essential to manage thatch levels and ensure a healthy turfgrass environment.