Ethiopian eggplant

Solanum aethiopicum

1. Identification and origin

The Ethiopian eggplant (Solanum aethiopicum L.), belonging to the Solanaceae family, is a species native to Africa, where it is widely cultivated as a traditional vegetable. It is known by various regional names, including “African scarlet eggplant”, “garden egg”, “nakati” and “gilo”. The species displays great morphological diversity, with distinct varietal groups used for fruit, leaf or both.

2. Economic importance

The Ethiopian eggplant is grown for fresh consumption, traditional cuisine, processing and sale in local markets. The fruits, with their characteristic bitter taste, are eaten boiled, grilled or in sauces. The leaves are used as a leafy vegetable in various African regions. The crop has growing importance in ethnic markets in Europe and America. It is a hardy species, tolerant of heat and poor soils, making it an interesting alternative for family farming.

3. Botanical characterisation

A herbaceous or subshrubby plant, annual or short-lived perennial, 0.5–1.5 m in height. The stems are erect, branched, and may bear spines. The leaves are large, ovate, with wavy margins. The flowers are white or violet, typical of the Solanaceae. The fruits vary widely in shape and colour: globose, oval or flattened, green, white, orange or red, depending on the varietal group. The root system is deep and well adapted to conditions of moderate drought.

4. Soil and climate requirements

It prefers warm tropical and subtropical climates, with ideal temperatures between 22–30 °C. It tolerates intense heat better than the common eggplant (Solanum melongena). It requires well-drained soils, of medium texture, rich in organic matter, with a pH between 5.5 and 6.8. It is sensitive to waterlogging and frost. The crop responds well to regular watering, especially during fruiting.

5. Main pests

• Whitefly (Bemisia tabaci, Trialeurodes vaporariorum): sap sucking and virus transmission.
• Aphids (Aphis gossypii, Myzus persicae): leaf curling and honeydew.
• Mites (Tetranychus spp.): chlorosis and fine webbing in dry conditions.
• Caterpillars (Noctuidae): perforations in leaves and fruits.
• Nematodes (Meloidogyne spp.): root galls and reduced vigour.

6. Main diseases

• Wilt caused by Fusarium (Fusarium oxysporum): yellowing and death of plants.
• Leaf spot (Cercospora spp.): circular lesions and premature leaf drop.
• Powdery mildew (Leveillula taurica, Erysiphe spp.): white coating and reduced photosynthesis.
• Root rots (Phytophthora spp., Pythium spp.): wilting and rotting in moist soils.
• Viruses (TYLCV, CMV): mosaics, deformations and reduced production.

7. General crop management

It includes the choice of varieties adapted to the local climate, sowing in a nursery and transplanting when the plants reach 10–15 cm, planting in well-drained soils, regular watering without waterlogging, balanced fertilisation and monitoring of pests and diseases. Crop rotation with non-host species is essential to reduce nematodes and soil-borne diseases. Harvesting is carried out when the fruits reach the desired size and colour, before they lose firmness.

Bibliographic references

• EPPO Global Database. Solanum aethiopicum – pests and diseases.
• CABI Invasive Species Compendium. Solanum aethiopicum – datasheets.
• Lester, R. N., & Daunay, M. C. (2003). African eggplants. In: Chakrabarty, T., et al. (Eds.), Solanaceae: Biology and Utilization. CABI.
• Schippers, R. R. (2000). African Indigenous Vegetables. In: Natural Resources Institute.
• Prohens, J., et al. (2012). Eggplant and relatives. In: Kole, C. (Ed.), Wild Crop Relatives. Springer.