Draft:Leaf necrosis
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Submission declined on 9 June 2026 by Insillaciv (talk). This draft appears to contain text generated by a large language model (such as ChatGPT). You cannot use LLMs to generate article content.
Declined by Insillaciv 2 months ago.LLM-generated pages with certain obvious signs of being machine generated may be deleted without notice. Instead, only summarize in your own words a range of independent, reliable, published sources that discuss the subject. See the advice page on large language models for more information. | |
Comment: Having a standalone page on this is redundant and unnecessary, please merge any relevant material. ᴢxᴄᴠʙɴᴍ (ᴛ) 10:06, 7 August 2026 (UTC)
- Comment: 79% probability on gptzero that this is LLM Insillaciv (talk) 12:42, 9 June 2026 (UTC)
 | This is a draft article. It is a work in progress open to editing by anyone. Please ensure core content policies are met before publishing it as a live Wikipedia article. Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL Last edited by Zxcvbnm (talk | contribs) 4 days ago. (Update)
Finished drafting? |
Leaf necrosis is a form of necrosis affecting plant leaves. It is characterized by the death of leaf tissue [1]
Necrotic tissue commonly appears brown, black or grey, depending on the plant species and tissue age.
In plant pathology, necrosis is considered a symptom rather than a disease itself. It can result from many unrelated biotic and abiotic factors.[2]
Leaf necrosis may occur as small localized spots. It may be is a form of marginal browning, tip burn, or complete death of the leaf. It may develop also after earlier symptoms such as chlorosis, wilting, scorch, or mechanical injury.
Causes
[edit]Leaf necrosis can be caused by nutrient disorders, infectious plant diseases or environmental stress as the main factors.
Nutrient deficiency
[edit]Nutrient deficiencies can cause leaf necrosis when the supply (or movement) of essential mineral elements is insufficient for normal growth.
Deficiencies of mobile nutrients, such as nitrogen, phosphorus, potassium, and magnesium, often appear first on older leaves, because these nutrients can be moved from older tissue to younger growing tissue.
Such deficiencies may begin as chlorosis and later progress to necrosis.[3]
Calcium deficiency is commonly associated with necrosis of young tissues, leaf tips, and leaf margins. Calcium has an important structural role in plant cell walls, where it helps cross-link pectin residues.[4][5]
When calcium supply or transport is inadequate, rapidly growing tissues may show distorted growth, necrotic areas, and death of growing points.[6]
Potassium deficiency may also produce necrosis, especially on older leaves, while magnesium deficiency may lead to interveinal chlorosis followed by necrotic patches.[7]
Pathogens
[edit]Leaf necrosis is a common symptom of infectious plant diseases. Fungal, bacterial, viral, and other pathogens can cause necrotic leaf spots or other visual abnormality (blights, lesions, or tissue collapse). Necrosis can also occur during the plant hypersensitive response. This response may restrict some biotrophic pathogens, but necrotrophic pathogens can benefit from or exploit host cell death.[8]
Environmental stress
[edit]Abiotic stress can produce leaf necrosis without the involvement of an infectious organism.
Salt stress may cause marginal leaf necrosis, stunted growth, and other symptoms associated with high electrical conductivity in soil or growing media.[9]
Diagnosis
[edit]Diagnosis of leaf necrosis usually requires observation of the whole plant rather than a single leaf. Abiotic disorders often affect many leaves in a similar pattern, while infectious diseases may begin as scattered lesions and spread under favourable conditions.[10]
See also
[edit]References
[edit]- ↑ van Doorn, W. G.; Woltering, E. J. (2011). "Morphological classification of plant cell deaths". Cell Death and Differentiation.
- ↑ "Signs and Symptoms Point the Way". American Phytopathological Society. Retrieved 8 June 2026.
- ↑ Wong, Melvin (2006). "Mature Leaf Chlorosis and Necrosis" (PDF). Landscape. University of Hawaiʻi at Mānoa.
- ↑ Hepler, Peter K. (2005). "Calcium: A Central Regulator of Plant Growth and Development". The Plant Cell.
- ↑ White, Philip J.; Broadley, Martin R. (2003). "Calcium in Plants". Annals of Botany.
- ↑ "Identifying Plant Nutrient Deficiencies: Calcium". Iowa State University Extension and Outreach. Retrieved 8 June 2026.
- ↑ "Nutrient Deficiency of Trees and Shrubs". University of Maryland Extension. Retrieved 8 June 2026.
- ↑ Balint-Kurti, Peter (2019). "The plant hypersensitive response: concepts, control and consequences". Molecular Plant Pathology.
- ↑ "Salinity Matters for High Tunnels and Growing Media: How to interpret salinity test results" (PDF). University of Maryland Extension. Retrieved 8 June 2026.
- ↑ "Plant Disease Identification and Control". Penn State Extension. Retrieved 8 June 2026.