Water heating by a domestic water heater. Two conflicting safety issues affect water heater temperature—the risk of scalding from excessively hot water greater than , and the risk of incubating bacteria colonies, particularly "Legionella", in water that is not hot enough to kill them. Both risks are potentially life-threatening and are balanced by setting the water heater's thermostat to . The European Guidelines for Control and Prevention of Travel Associated Legionnaires’ Disease recommend that hot water should be stored at and distributed so that a temperature of at least and preferably is achieved within one minute at points of use. If there
Wilt disease leafhopper. Mimosa wilt is caused by the fungus "Fusarium oxysporum". It enters through the roots and spreads into the vascular system through the tree's sap. As it grows it clogs the vascular tissue leading to yellowing leaves and defoliation. Oak wilt is a fungal caused by "Ceratocystis fagacearum", is a disease originating in eastern Russia. It can slowly or quickly kill an oak tree when the tree reacts to the fungus by plugging its own cambial tissue while attempting to block the spread of the fungus. This plug prevents the cambium vascular tissue from delivering nutrients and water to the