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23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 1 23456789012345678901234567890121234567890123456789012345678901212345 123456789012345678901234567890121234567890123456789012345678901212345 Contents Algae ................................................ 3 Brown Patch ........................................... 4 Dollar Spot ............................................ 4 Fairy Rings ............................................. 5 Fusarium Patch (Pink Snow Mold) ............................ 5 Helminthosporium Diseases ................................ 6 Moss ................................................. 6 Nematodes ............................................ 6 Powdery Mildew ........................................ 7 Pythium Blight .......................................... 7 Red Thread ............................................ 7 Rust ................................................. 8 Slime Molds ........................................... 8 Spring Dead Spot ........................................ 8 Stripe Smut ............................................ 9 White Patch ............................................ 9 Chemical Control of Diseases of Lawn and Turf .................. 10 Turf Disease Calendar .................................... 16 2 THE UNIVERSITY OF TENNESSEE AGRICULTURAL EXTENSION SERVICE Turfgrass Diseases and Their Control Alan Windham, Professor Entomology and Plant Pathology Many diseases occur on the different turfgrasses eases. The system of using all available disease con- that are used throughout Tennessee. Most of the dis- trol methods usually results in the best turf. eases are caused by fungi and nematodes. Some Fungicides and nematicides can be used in pre- problems such as wilt, cold damage, heat, high ventative or curative disease control programs. soluble salts, soil compaction or chemical damage Chemicals are applied before disease is evident that resemble diseases are caused by environmen- when weather conditions are favorable for disease tal or management factors. Careful identification of development in a preventative program. This the cause of the problem is important when select- method is best for some rapidly spreading diseases ing proper control methods. The information pre- such as Pythium blight. Some of the newer chemi- sented in this publication should help you identify cals that control diseases for longer periods work the most important diseases of turfgrasses and se- well as preventatives. lect proper management practices and chemicals for Chemicals are applied in a curative program their control. after some disease is present. This method requires Susceptible plants, a favorable environment and rapid identification of the disease, selection of a pathogen are required for a disease to develop. proper chemicals and usually higher rates of the Disease will not develop unless these factors are chemicals for control. Nematicides can be used as a present at the same time over a certain length of curative if nematode assay results indicate nema- time. Free water on leaves and optimum tempera-