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Red Thread

SEASON: Fall.

APPEARANCE: Small spots that appear water-soaked enlarge rapidly to cover a large part of the leaf. As the spots dry, the leaves fade to a light brown or tan. Pink webs bind the grass blades together. Later, the fungus forms thin, red-to-pink, finger-like structures at the tips of grass leaves, which gives the lawn a reddish cast.

FAVORABLE CONDITIONS: Most damaging in spring and fall in temperatures of 68º to 75º F and high humidity. Low levels of nitrogen favor its development. When the grass growth slows down due to a lack of nitrogen, the disease then becomes more prevalent.

SUSCEPTIBLE GRASSES: Red fescue, ryegrass, Kentucky bluegrass, and bentgrass.

RESISTANT VARIETIES: 'Biljart' and 'Claudia' fine fescues; 'Chateau' Kentucky bluegrass; 'Pennant' perennial ryegrass

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