This devastating disease has spread rapidly along the southeastern seaboard of the U.S. since 2003 and has begun to affect commercial avocado production in Florida. Laurel wilt is spread by ambrosia beetles and interconnected roots of avocado trees. The time from infection to tree mortality ranges from four to eight weeks. To prevent spread of the disease, it is important that trees be destroyed as soon as they are affected by the disease.
Although black or white streaks are shocking when they appear on an otherwise healthy lawn, the incidence of slime mold is rarely harmful. Slime mold is actually caused by the small round fruiting bodies of a special type of fungi, called Myxomycetes, which are regularly present in the soil. It usually appears on warm humid days in late spring or early summer after extended periods of rain. ---"Slime Mold: Only a Cosmetic Problem," Gardening in the Panhandle (6/17/2013)