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necrosis (GB)

General term (lat. Nékrosis = killing, also necrobiotic) for the death of cells, parts of tissues or areas of organs in plants as a pathological reaction to certain effects with different causes (in the case of complete death of a plant one speaks of apoplexy ). Necrosis is triggered by harmful influences on the cell. The causes are lack of nutrients and oxygen, Poisons, too high a content of salt in the ground, water stress (Lack of water), radioactivity etc. As a result, the cells die in the tissue and then mostly an inflammatory reaction. Depending on the type of tissue and the extent of damage, the necrosis heals completely through regrowth of surviving cells, or the dead part of the tissue is replaced by a connective tissue scar. The necrosis mainly manifests itself first by a yellow or red to black-brown discoloration of the leaves, Later necrotic spots (dark pustules) form on the leaves.

Necrosis - Esca (leaf), Schwarzfuß disease (root), Pierce Disease (leaf) and Eutypiose (wood)

In viticulture, necrosis is a symptom or sequela in many different diseases, which are characterized by dark discoloration of roots, woody parts and foliage of the vine shows. The causes can include certain species bacteria. virus or mushrooms his. Rebstock diseases are with necrotic symptoms Bacteria necrosis. chlorosis. Esca. eutypa dieback. Flavescence doree, Wrong mildew. Pierce Disease. Red burner. black rot. Black spots disease. Blackfoot disease. stem necrosis. yellowing and white rot, See also a list of all diseases and pests below Vine enemies,

Esca: By Bauer Karl - Own work, CC BY 3.0 at , Link
Schwarzfuß disease: Laimburg test center
Pierce Disease: © enbiotech srl
Eutypiosis: INRA Science & Impact - Photo P. Lecomte

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