TechNotes Tips - 12.13.01

Powdery mildew is present in many parts of the country on Kentucky bluegrass turfs. This disease is associated with extended periods of low light conditions. It is most obvious on turf in shade. In the northern United States it is being observed in areas under trees such as crabapples, and maples even without leaves being present on these trees. The potential for significant thinning of the turf under these trees by late spring is high. For more information on powdery mildew see:

http://ohioline.osu.edu/hyg-fact/3000/3081.html

Along with powdery mildew, rust is evident on many turfs. Infected areas are generally characterized by slow growing turf. Rust appears on turfgrass leaf blades as small oranges spots (pustules) on the leaf. Rust is most severe on Kentucky bluegrass and perennial ryegrass but can also occur on the fescues. Rust can cause thinning of the turf.