Melon

Cucumis melo

1. Identification and origin

The melon (Cucumis melo L.), belonging to the Cucurbitaceae family, is a species native to East Africa and Southwest Asia, domesticated more than 4,000 years ago. The species displays great genetic and morphological diversity, including groups such as cantaloupe, galia, pele‑de‑sapo, honeydew, charentais and other regional types. Its historical spread occurred through Mediterranean and Asian trade routes, making it one of the main cucurbits grown globally.

2. Economic importance

The melon is widely consumed fresh, in salads, desserts and juices, being valued for its sweet flavour, aroma and high water content. The main producers include China, Turkey, Iran, India, Spain, Brazil and the United States. The international market favours fruits with high sweetness (°Brix), good post‑harvest storage and resistance to transport.

3. Botanical characterization

An annual herbaceous plant, creeping or climbing, with long, branched and hairy stems. The leaves are large, rounded or lobed, with a rough texture. The flowers are yellow, unisexual, with predominantly entomophilous pollination. The fruit is a modified berry (pepo), with a variable rind (smooth, netted, wrinkled), juicy flesh that is white, green, yellow or orange, and numerous seeds. The root system is deep and well adapted to dry soils.

4. Soil and climate requirements

The melon adapts to hot, dry climates, with ideal temperatures between 25–35 °C. It is sensitive to cold and does not tolerate frost. It prefers light, well‑drained soils of sandy to sandy‑loam texture, with a pH between 6.0 and 7.5. It requires high light levels and controlled irrigation, avoiding waterlogging, especially during the ripening phase, to prevent cracking and loss of quality.

5. Main pests

• Whitefly (Bemisia tabaci): Honeydew, sooty mould and transmission of viral diseases.
• Aphids (Aphis gossypii, Myzus persicae): Sap sucking and virus transmission.
• Thrips (Frankliniella occidentalis, Thrips tabaci): Damage to leaves and flowers.
• Mites (Tetranychus urticae): Chlorosis and fine webbing in dry conditions.
• Caterpillars (Noctuidae): Defoliation and damage to shoots.
• Nematodes (Meloidogyne spp., Pratylenchus spp.): Root galls and reduction of vigour.

6. Main diseases

• Downy mildew (Pseudoperonospora cubensis): Angular spots and leaf necrosis.
• Powdery mildew (Podosphaera xanthii, Erysiphe cichoracearum): White coating and reduction of photosynthesis.
• Anthracnose (Colletotrichum orbiculare): Leaf lesions and fruit rots.
• Fusarium wilt (Fusarium oxysporum f. sp. melonis): Vascular wilt and plant death.
• Gummy stem blight (Didymella bryoniae): Cankers on stems and fruit rots.
• Viruses (WMV, ZYMV, CMV): Mosaics, deformations and reduced production.

7. General crop management

This includes the choice of cultivars adapted to the local climate, sowing in well‑drained soils, crop rotation to reduce the pressure of diseases and nematodes, weed control, regular irrigation without waterlogging and monitoring of downy mildew, powdery mildew and whitefly. Pollination must be ensured with beehives. Harvesting is carried out when the fruit reaches its characteristic aroma, a change in rind colour and natural detachment of the peduncle (depending on the varietal group).

Bibliographic references

• EPPO Global Database. Cucumis melo – pests and diseases.
• CABI Invasive Species Compendium. Cucumis melo – datasheets.
• Robinson, R. W., & Decker‑Walters, D. S. (1997). Cucurbits. CAB International.
• Pitrat, M. (2016). Melon. In: Handbook of Plant Breeding – Vegetables. Springer.
• FAO (2019). Melon production statistics.