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Necrosis

necrosis (GB)

General term (Latin nékrosis = killing, also necrobiosis) for the death (withering) of cells, tissue parts or organ districts in plants as a pathological reaction to certain influences with different causes (in the case of complete death of a plant, one speaks of apoplexy). Necrosis is triggered by damaging influences on the cell. The causes are lack of nutrients and oxygen, toxins, too much salt in the soil, water stress (lack of water), radioactivity, etc. As a result, the cells in the tissue die off, followed mostly by 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 tissue part is replaced by a connective tissue scar.

Nekrose - Esca (Blatt), Schwarzfuß-Krankheit (Wurzel), Pierce Disease (Blatt) und Eutypiose (Holz)

Necrosis mainly manifests itself first by a yellow or red to black-brown discolouration of the leaves. Later, necrotic spots (dark pustules) form on the leaves. In viticulture, necrosis is a symptom or consequence of many different diseases, which is manifested by dark discolouration of roots, woody parts and foliage of the vine. The causes can be, among others, species of certain bacteria, viruses or fungi. Vine diseases with necrotic symptoms are bacterial necrosis, chlorosis, esca, eutypiosis, flavescence dorée, downy mildew, pierce disease, red blight, black rot, black spot disease, black foot disease, stem paralysis, yellowing and white rot. See also a list of all diseases and pests under Vine Enemies.

Esca: By Bauer Karl - Own work, CC BY 3.0 at, Link
Blackfoot disease: Experimental Centre Laimburg
Pierce Disease: ©enbiotech s.r.l.
Eutypiosis: INRA Science & Impact - Photo P. Lecomte

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