Diseases

Cucumber tissue necrosis

Cucumis sativus L.

Cucumber tissue necrosis manifests as a viral disease caused by Cucumber necrosis virus (CuNV), or as a non-infectious disorder triggered by nutrient deficiency, abiotic stress, or unfavorable microclimate.

In the reference 5 varieties crop Cucumber, where this is mentioned in the description.

Viral cucumber necrosis is caused by Cucumber necrosis virus (CuNV), which is soil-borne and transmitted by zoospores of the chytrid fungus Olpidium bornovanus. The disease is most typical in greenhouse conditions and manifests as necrotic spots, often localized along the veins, leaf deformation, chlorosis, and general stunting, which, in cases of systemic infection, leads to plant death within two months.

Non-infectious forms of necrosis occur due to physiological disorders: phosphorus, potassium, or manganese deficiency, exposure to sharp temperature fluctuations, sunburn, mechanical damage by wind, or stress from spectral exposure. Externally, this is manifested by marginal leaf scorch, small-point lesions, or tissue death between the veins.

In cucumber breeding, there are currently no universally accepted gene symbols for resistance to Cucumber necrosis virus, and work on identifying resistance loci is at the research stage. Commercial hybrids with complex resistance to this virus are limited, as sources of resistance within the species Cucumis sativus have not been sufficiently studied.

General information about the subject — on the page Tissue necrosis.

Sources8

Varieties of Cucumber mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.