Inside and outside views of the geode. Geode (Greek Î³ÎµÏÎ´Î·Ï - ge-ÅdÄs, earthlike) are geological secondary structures which occur in certain sedimentary and volcanic rocks. They are themselves of sedimentary origin formed by chemical precipitation.
The Rhizoctonia solani fungus attacks zoysia grass and causes a disorder called large brown patch. Small, rounded spots of discolored, water-soaked grass appear on zoysia lawns.These damaged areas often have a yellowish ring of dying grass around their perimeters.oysia is a species of warm-weather grass native to Southeast Asia. Named after Karl von Zois, an 18th-century botanist from Austria, zoysia became popular with United States homeowners in the 1940s and 1950s, particularly in the southern United States, because these grasses perform well in warm climates.
Fungal Infection. Brown patch is a fungal infection of zoysia grass responsible for the presence of brown spots. Caused by the fungus Rhizoctonia solani, brown patch also occurs on other grasses like perennial rye and bluegrass, according to the University of Nebraska-Lincoln Extension.atural Control. Remove and destroy affected grass after mowing to prevent disease spread. When mowing grass, use a sharp mower blade instead of a dull one; dull blades don't make a clean cut and create wounds that fungi can easily invade.