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.
Brown spots, also called liver spots or age spots, are caused by sun exposure. They occur most often on the face, the backs of the hands, and other areas often exposed to sun. They are sometimes tan-colored rather than brown and are medically known as lentigines. Melasma is another type of brown spot. Melasma is caused by sun exposure and is more common in women who are pregnant or on oral contraceptives. These types of brown spots are harmless. In rare cases, brown spots are caused by certain hereditary illnesses.