| Material Information
||Key for identification of landscape turfgrass diseases
||Plant Pathology Fact Sheet PP-60
||Elliot, Monica L.
Simone, Gary W.
||University of Florida -- Florida Cooperative Extension Service -- Department of Plant Pathology -- Institute of Food and Agricultural Sciences
||Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida
||North America -- United States of America -- Florida
Plant Pathology Fact Sheet
Key for Identification of Landscape Turfgrass
Monica L. Elliott, Associate Professor, Ft. Lauderdale Research and Education
Center, University of Florida, 3205 College Ave, Ft. Lauderdale, Fl 33314 and
Gary W. Simone, Professor Emeritus Plant Pathology Department, University of
Florida, Gainesville, Florida 32611. Revised April 2001
Florida Cooperative Extension Service/ Institute of Food and Agricultural Sciences/ University of Florida/ Christine Waddill, Dean
The following is a general key that may help in making a preliminary diagnosis. Please see the following section for
more specific diagnostic characteristics, and information concerning the time of year the disease is most likely to
A. Distinct patches of yellow to brown-colored turfgrass are present.
1. Patch areas are less than 3 inches in diameter. Leaf spot lesions present. Dollar Spot
2. Patch areas are greater than 3 inches in diameter. Leaf spot lesions not present.
a. Ring or arc of lush growth or dead grass; mushrooms may be present. Fairy Ring
b. No rings or arc of lush growth.
i. Affected areas are distinct circular patches. Leaf pulls out of leaf sheath very easily.
ii. Affected areas are irregular patches of 8 to 24 inches diameter or larger with mixture of yellow
and dead grass. Roots are short and black. Stolons may be rotted also. Take-all Root Rot
B. No distinct patches are present.
1. Orange 'spots' present on leaves; 'spots' rub off easily. Rust
2. Orange 'spots' not present on leaves.
a. Leaf spots present.
i. Primarily on bermudagrass and ryegrass. Leaf spots have wide range of sizes.
Helminthosporium' Leaf Spot
ii. Primarily on St. Augustinegrass in summer. Leaf spots oval to irregular with brown borders
and tan to gray centers. Gray Leaf Spot
iii.Primarily on St. Augustinegrass in late spring and summer. Narrow, dark brown leaf spots
initially, then become oblong, irregular spots with dark tan centers with brown borders
Cercospora Leaf Spot
iv. Primarily on centipedegrass. Reddish-brown to brown spots
surrounded by yellow halo. Anthracnose
b. No leaf spots present.
i. Grass covered with an easily removed slimy or crusty growth Slime Mold
ii. Grass is chlorotic (yellow) or has mottled leaves associated with general decline
Pythium Root Rot