Which grass species is usually the only turfgrass host of powdery mildew in Tennessee?

The correct choice regarding the turfgrass species that typically serves as the primary host for powdery mildew in Tennessee is bluegrass. This is significant because powdery mildew is a fungal disease that can adversely affect turf quality and health, and understanding its host preferences is crucial for effective management.

Bluegrass, especially Kentucky bluegrass, is particularly prone to powdery mildew in Tennessee due to its growth habits and the climatic conditions prevalent in the region. Factors such as shade, high humidity, and moderate temperatures create an ideal environment for the development of this fungal disease, making bluegrass more susceptible compared to other turfgrass species. This susceptibility can lead to the distinct white, powdery fungal growth on the leaf surfaces, which is characteristic of powdery mildew, ultimately impacting the overall appearance and vigor of the lawn.

In contrast, while Bermuda grass, tall fescue, and perennial ryegrass can experience various diseases, they are not typically associated with powdery mildew as consistently as bluegrass. This knowledge is essential for turf managers in Tennessee to implement monitoring and control strategies tailored specifically to bluegrass to mitigate the risks posed by powdery mildew.