Which turfgrasses perform best in full sun and can suffer from diseases in shaded areas?

Kentucky Bluegrass and ryegrasses are well-suited for full sun conditions and thrive with adequate light and moisture. These grasses prefer a sunny environment for optimal growth, as both types can develop a robust root system and a dense turf when exposed to full sunlight.

In shaded areas, Kentucky Bluegrass often becomes susceptible to various diseases due to reduced air circulation and higher humidity levels, which can promote fungal infections like leaf spot or dollar spot. Ryegrass, while slightly more shade tolerant than Kentucky Bluegrass, can also face challenges in low light, making it less vigorous and more vulnerable to disease in these conditions.

The other options primarily include species or mixtures that are more tolerant of shade, such as fine fescue and improved turf-type tall fescue, which can perform better in low-light conditions and are not as reliant on full sun for health and vigor. Consequently, Kentucky Bluegrass and ryegrasses are the best fit for the question regarding performance in full sun versus susceptibility to disease in shaded areas.