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Brown SpotBrown Patch is a disease that is caused by the Rhizoctonia fungus. It causes patches that look brown, sunken and sometimes present a white fungus on early-morning dew-covered grass. Often, these patches thin the grass, but don't completely kill off the grass within the patch. The edges of these mostly circular patches often present a deep-greenish-purplish color, appearing more prominent earlier in the day, fading by the evening.
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Leaf SpotLeaf spot is caused by a group of fungi in the genera Bipolaris, Drechslera, and Exserohilum. The fungi first invade the blades, creating small brown spots. These spots become larger, turning a dark purplish-red with a tan center, as the disease gets worse. The spots will soon cover the entire leaf blade. The disease can result in severe thinning of the grass. This is because it causes what is called "melting-out", which causes the crowns and roots of the grass rot, severely damaging them.
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RustRust is a disease that specifically infects grass that is slow-growing. Therefor, different factors that lead to poor growth of grass are very favorable to the rust disease, such as: hot summers, drought stress, low nitrogen levels, compaction and shade. Rust causes a yellowish-green cast on the grass, and can result in a orangey-rust like color to rub off on shoes and clothes upon contact. Although it is largely a cosmetic issue, it can be very harmful to grasses newly seeded in spring.
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