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 on the leaves of hydrangea shrubs are mainly caused by leaf spot diseases, which can either be fungal or bacterial in nature. Cercospora leaf spot and anthracnose are common fungal infections that affect hydrangeas, while bacterial leaf spot is commonly caused by the pathogen Xanthomonas campestris.