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Common Turf Disease Diagnosis and Chemical Solution


Anthracnose


Anthracnose

Warm and cool season grasses.

TM4.5SELECT, PROPICONAZOLE


Anthracnose typically infects turfgrass during warm weather. It causes irregularly shaped patches that are yellow to brown in color. Leaf lesions that are yellow with black centers may also occur. Anthracnose also causes a basal stem and leaf sheath rot during cool, wet weather in the spring and warm, moist weather in the summer. Infected shoots are easily detached.

Brown Patch


Brown Patch

Almost all turfgrasses.

TM4.5SELECT, PROPICONAZOLE

Symptoms:
The symptoms of brown patch can vary depending on the grass species, climatic and atmospheric conditions, and soil management of the turfgrass. This disease typically causes rings and/or patches of blighted turfgrass that measure 5 inches to more than 10 feet in diameter. It also causes leaf spots and “smoke rings” - thin, brown borders around the diseased patches that appear most frequently in the early morning.

Dollar Spot


Dollar Spot

All species of warm- and cool-season turfgrass. Georgia has seen cases in Tall fescues, Bentgrass, Bermuda hybrids and Centipede.

PPZ 41.8, PROPICONAZOLE

Symptoms:
Symptoms of dollar spot includes sunken, circular patches that measure up to several inches on turfgrass. The patches turn from brown to straw color and may eventually grow together, forming irregularly shaped areas. Infected leaves may display small lesions that turn from yellow-green to straw color with a reddish-brown border. The lesions can extend the full width of the leaf. Multiple lesions may occur.

Fairy Ring


Fairy Ring

All species of warm- and cool-season turfgrass. Particularly damaging in Centipede and St. Augustine grass in south and coastal Georgia.

AZOXY50WDG, HERITAGE

Symptoms:
Fairy ring symptoms vary based on the cause. Above-ground mushroom and puff ball basidiocarps may or may not occur. Typically, this disease has outer rings that are either dark-green or brown in color. The shape and size of the rings vary depending on the species. Activity in the turf ceases when the individual rings come in contact with each other. Some causal agents form agents form fruiting bodies but do not form rings.

Gray Leaf Spot


Gray Leaf Spot

St. Augustine, Perennial ryegrass, Bermuda, Centipede, Bentgrass, and various species of Fescue grass

PPZ 41.8, PROPICONAZOLE

Symptoms:
The symptoms of gray leaf spot vary depending on the grass type. On St. Augustine grass, gray leaf spot first appears as small, brown spots on the leaves and stems. The spots quickly enlarge to approximately 1/4 inch in length and become bluish-gray in color and oval or elongated in shape. The mature lesions are tan to gray in color and have depressed centers with irregular margins that are purple to brown in color.

Large Patch


Large Patch

Zoysia and Bermuda grass

PPZ 41.8, PROPICONAZOLE

Symptoms:
Large patch occurs during the spring and fall, when warm-season turf grasses are entering or exiting their period of winter dormancy. Circular patches of diseased turf are observed, ranging in diameter from less than 3 ft. up to 25 ft. Leaves of recently infected turf, located at the periphery of the patch, may appear orange in color. Some patches may be perennial, recurring in the same location and expanding in diameter year after year.

Leaf Spot Melting-out


Leaf Spot

All turfgrasses

PPZ 41.8, PROPICONAZOLE

Symptoms:
Leaf spot symptoms include purplish-brown to black spots with tan centers on the leaf blade and sheath. The lower leaves of the infected plants become shriveled and blighted. Severe leaf spot can lead to melting-out when leaves and tillers are infected, causing severe thinning of the stand. On cool season turfgrass, melting-out typically follows the appearance of leaf spots.

Pythium Blight


Pythium Blight

Tall Fescue, Perennial Ryegrass, ST Augustine and Bentgrass

AZOXY50WDG, FOSAL SELECT

Symptoms:
Mostly in tall fescue and Bentgrass. Pythium blight appears as yellow, irregularly shaped patches. The affected turfgrass is thin, off-color and slow growing, while the root system is only slightly stunted, with reduced volume and vigor. Foliar mycelium does occur.

Pythium Root Rot


Root Rot

Bermuda, Centipede, Zoysia and St.Augustine grass

AZOXY50WDG, FOSAL SELECT

Symptoms:
Pythium root rot is common on highly maintained turf. Although symptoms of Pythium root rot are typically non-distinctive, this disease can appear as yellow, irregularly shaped patches. The affected turfgrass is thin, off-color and slow growing, while the root system is stunted with reduced volume and vigor. Foliar mycelium does not occur.

Take All Root Rot


Take All

St. Augustine, Bentgrass, Bermuda and Centipede grass. Bluegrass and Fescues are rarely affected in Georgia..

PPZ 41.8, EAGLE 20EW

Symptoms:
Take-all patch causes wilted circular patches that are brown or bronze-colored and measure up to several feet in diameter. Infected plants have dark brown roots.