EXAM 1 PLSC 401

Dollar Spot

Disease characterized by small sunken circles and tan/reddish-brown leaf lesions.

Brown Patch

Caused by Rhizoctonia solani, with symptoms of patch appearance and tan leaf lesions with dark brown edges.

Pythium Blight

Caused by Pythium aphanidermatum, showing circular spots and oily lesions.

Anthracnose

Caused by Colletotrichum cereale, symptoms include yellow or reddish leaf discoloration and thinning of large areas.

Gray Leaf Spot

Caused by Pyricularia oryzae, symptoms include small water-soaked lesions and grayish masses of conidia.

Red Thread

Caused by Laetisaria fuciformis, symptoms include circular patches of straw brown turf and pinkish to red-orange mycelium.

Rust

Caused by Puccinia coronate, symptoms vary with each type but include yellow to orange patches and orange, brownish, yellow spores.

Powdery Mildew

Caused by Blumeria grannis, symptoms include yellowing of leaves and powdery white to grayish fungal growth.

Algae

Cyanobacteria causing slimy appearance, green mats, and indirect injury, favored by warm, humid conditions and poor drainage.

Take All Patch

Caused by Gaeumannomyces avenae, symptoms include small circular patches and light brown colors, favored by cool, wet weather.

Summer Patch

Caused by Magnaporthispsis poae, typical in older turfgrass with orange to reddish-brown patches, favored by wet soil conditions.

Fairy Ring

Caused by Basidomycetes, characterized by rings of dead grass, mushrooms, and extremely dry soil, favored by low fertility and thick thatch layers.