Spinach

Spinacia oleracea

1. Identification and origin

Spinach (Spinacia oleracea L.), belonging to the Amaranthaceae family (formerly Chenopodiaceae), is native to Central Asia, with domestication attributed to ancient Persia. The crop spread throughout Asia and Europe, becoming a vegetable of great importance in temperate regions.

2. Economic importance

Spinach is one of the most widely consumed leafy vegetables worldwide, valued for its high nutritional content and the strong demand in the fresh, fresh-cut and frozen markets. Countries such as China, the USA, Turkey, Italy and Spain stand out in production and export.

3. Botanical characterisation

An annual herbaceous plant of low habit, forming a basal rosette of simple, alternate leaves of variable shape (oval, lanceolate or triangular), tender texture and intense green colouring. The stem remains short during the vegetative phase, elongating in the reproductive phase. The flowers are small, unisexual, grouped in discreet inflorescences. The fruit is a small, dry achene.

4. Soil and climate requirements

Spinach adapts to cool temperate climates and is sensitive to high temperatures, which induce premature bolting. It prefers fertile, deep, well-drained soils with good availability of organic matter and a slightly acidic to neutral pH. It requires constant moisture but is sensitive to waterlogging and compacted soils.

5. Main pests

• Aphids (Aphis fabae, Myzus persicae): leaf deformations and transmission of viruses.
• Beet leaf miner (Pegomya hyoscyami): mines in young leaves.
• Caterpillars (Noctuidae): perforations and leaf consumption.
• Mites (Tetranychus urticae): chloroses and loss of vigour.
• Root-knot nematodes (Meloidogyne spp.): reduction of root development and vegetative growth.

6. Main diseases

• Downy mildew (Peronospora effusa): main disease of the crop; yellow spots and greyish sporulation on the lower surface.
• Powdery mildew (Erysiphe spp.): whitish coating on the leaves.
• Anthracnose (Colletotrichum dematium): dark lesions and leaf necroses.
• Root rots (Pythium spp., Rhizoctonia solani): death of seedlings and establishment failures.
• Viruses (CMV, BYMV): mosaics, deformations and reduction of vigour.

7. General crop management

This includes the selection of varieties adapted to the growing season and tolerant to downy mildew, preparation of well-drained soils, balanced fertilisation, regular irrigation without waterlogging, weed control, frequent monitoring of pests and diseases and careful harvesting to preserve leaf quality. The adoption of integrated management practices is essential to ensure productivity and commercial quality.

Bibliographic references

• EPPO Global Database. Spinacia oleracea – pests and diseases.
• CABI Invasive Species Compendium. Spinacia oleracea – datasheets.
• Koike, S. T., et al. (2007). Compendium of Spinach Diseases and Pests. APS Press.
• Morelock, T. E., & Correll, J. C. (2008). Spinach. In: J. Prohens & F. Nuez (Eds.), Vegetables I: Asteraceae, Brassicaceae, Chenopodicaceae, and Cucurbitaceae (pp. 189–218). Springer.
• Leskovar, D. I., & Kolenda, K. (2020). Spinach Production and Management. Horticulturae.