Plant Disease Management Handbook

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Grass for Seed - Slime Molds

Not eggs but various shapes produced by this slime mold.

permission from Steve Glaser, 2017.

Fruiting bodies can be seen all over these plants. This slide is labeled possibly Physarium.

OSU Extension Plant Pathology Slide Collection, circa 1950s.

Slime molds can be seen any time there is sufficient moisture, even in November.

Jay W. Pscheidt, 2021.

Globular or spherical structures form on grass blades.

Melodie Putnam, 1990.

Cause A fungus, Septoria sp., that survives unfavorable weather in winter and summer as mycelium and fruiting bodies (pycnidia) in infected plants and debris. In cool rain, spores in pycnidia ooze out and are splashed by water or carried on equipment to healthy plants. The fungus thrives in cool, moist weather. Undernourished, unmowed, or long turf suffers increased damage. Many grasses are affected. Extensive damage is not commonly observed.

Image related to Lawn and Turf-Septoria Leaf Spot (Tip Blight)

Leaf spots are gray before fading to a pale yellow and eventually whitish-gray. Small fruiting bodies form in the dead areas.

Photo by Ralph S. Byther

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Grass For Seed

Hosts Rusts typically occur on bluegrasses, ryegrasses, and fine fescues.

This slide is labeled rust on bluegrass."

Photo by Ralph S. Byther, 1975.

Yellow specks of rust on Perennial ryegrass leaf blades.

Smiley, 1994.

Note healthy leaf at bottom of image while the rest have rust on these perennial ryegrass leaves.

Smiley

Puccinia coronata teliosori.

Smiley, 1994.

Hosts The pathogen can attack all cool-season turfgrasses but is most severe on perennial ryegrass as well as, red and Chewing fescue, and bentgrass to a lesser extent. Hard fescue is resistant.