What could indicate drought stress in turfgrass?

Drought stress in turfgrass can be indicated by the condition of dry soil below the surface. When soil moisture levels drop significantly, the grass roots are unable to access the necessary water, which leads to stress in the turf. This lack of adequate moisture can result in visible symptoms such as wilting, leaf curling, and ultimately, the turf may begin to turn brown and develop dead patches. By checking the moisture content in the soil, especially at deeper levels, it becomes possible to confirm if drought stress is occurring, as surface moisture can sometimes appear adequate while sub-surface conditions may still be dry.

Other options might present different turfgrass issues, but they do not directly indicate drought stress. A white cast on leaves could be related to fungal diseases such as powdery mildew rather than water deficiency. Excessive thatch can lead to problems with drainage and water retention but does not necessarily indicate drought stress directly; it can also indicate over-fertilization or improper turf management. Irregular patches of dead turf can indicate a range of issues, including disease or pest damage, rather than solely pointing to drought conditions. Thus, the dry soil below the surface is the most direct indicator of drought stress in turfgrass.