General term (lat. Nékrosis = the killing, also necrobiose) for the death of cells, tissue parts or organ districts in plants as a pathological reaction to certain effects with different cause (in complete dying of a plant is called apoplexy ). A necrosis is triggered by harmful effects on the cell. The causes are lack of nutrients and oxygen, Poisons, too high content salt in the ground, water stress (Lack of water), radioactivity, etc. As a result, the cells die off in the tissue and then usually lead to an inflammatory reaction. Depending on the type of tissue and extent of damage, necrosis heals completely by regrowth of surviving cells, or the dead tissue is replaced by a connective tissue scar. The necrosis mainly manifests itself first by a yellow or red to blackish brown discoloration of the leaves, Later, necrotic spots (dark pustules) form on the leaves.
In viticulture, necrosis is a symptom or sequelae in many different diseases, which are characterized by dark discoloration of roots, woody parts and foliage of the vine shows. Among other things, the causes may be more specific bacteria. virus or mushrooms his. Rebstock diseases with necrotic symptoms are Bacteria necrosis. chlorosis. Esca. eutypa dieback. Flavescence dorée, Wrong mildew. Pierce Disease. Red burner. black rot. Black spots disease. Blackfoot disease. stem necrosis. yellowing and white rot, See also a listing of all diseases and pests below Vine enemies,