Pearl Millet

Pennisetum glaucum

1. Identification and origin

Pearl millet [Pennisetum glaucum (L.) R.Br.], belonging to the Poaceae family, is a cereal of African origin, with its centre of domestication in the Sahel region (Niger, Mali, Chad). It is one of the oldest crops on the African continent, adapted to arid and semi-arid environments. The species stands out for its high tolerance to drought, high temperatures and poor soils, being essential for food security in dry tropical regions.

2. Economic importance

Pearl millet is used in human food (flours, porridges, breads, fermented beverages), in animal feed (grain and forage) and as a cover crop. It is fundamental in subsistence farming systems in Africa and India, but is also gaining importance in production systems resilient to climate change. The main producers include India, Niger, Nigeria, Mali, Burkina Faso and Sudan. The grain is rich in proteins, fibre and minerals, being naturally gluten-free.

3. Botanical characterisation

An annual, tufted plant, 1–3 m tall, with erect culms and long, narrow leaves. The inflorescence is a cylindrical and compact spike, characteristic of the species. The seeds are small, spherical, cream, yellow or greyish in colour. The root system is deep and highly efficient in the exploitation of water and nutrients, conferring great tolerance to drought.

4. Soil and climate requirements

Pearl millet adapts to hot and dry climates, with ideal temperatures between 25–35 °C. It tolerates low rainfall (300–600 mm/year) and poor, sandy or stony soils. It prefers a pH between 5.5 and 7.0 and is more tolerant of salinity than other cereals. It is a short-cycle crop (70–120 days), suitable for regions with short or irregular growing seasons.

5. Main pests

• Defoliating caterpillars (Noctuidae): Severe defoliation in seedlings and young plants.
• Millet shoot fly (Atherigona approximata): Damage to the apical meristem, causing “dead heart”.
• Aphids (Sitobion avenae, Rhopalosiphum maidis): Sap sucking and transmission of viruses.
• Stink bugs (Pentatomidae): Damage to panicles and developing grains.
• Storage weevils (Sitophilus spp.): Post-harvest losses.
• Nematodes (Meloidogyne spp., Pratylenchus spp.): Root galls and reduction of vigour.

6. Main diseases

• Pearl millet downy mildew (Sclerospora graminicola): One of the most serious diseases, causing chlorosis, deformations and sterility.
• Rust (Puccinia substriata var. indica): Leaf pustules and reduction of photosynthesis.
• Smut (Tolyposporium penicillariae): Replacement of the grains by dark masses of spores.
• Leaf spot (Pyricularia grisea): Elliptical lesions and necrosis.
• Root rots (Fusarium spp., Rhizoctonia solani): Wilting and death of seedlings.
• Mosaic virus (MMV): Mosaics, chlorosis and reduction of production.

7. General crop management

It includes the choice of cultivars adapted to the local climate, sowing in well-drained soils, crop rotation to reduce pressure from diseases and nematodes, weed control in the early stages and monitoring of caterpillars and downy mildew. Fertilisation should be balanced, focused on nitrogen and micronutrients. Harvesting is carried out when the panicles present hard and dry grains, followed by proper drying to avoid losses in storage.

Bibliographic references

• EPPO Global Database. Pennisetum glaucum – pests and diseases.
• CABI Invasive Species Compendium. Pennisetum glaucum – datasheets.
• Rai, K. N., et al. (2009). Pearl millet. In: Carena, M. J. (Ed.), Cereals. Springer.
• Serba, D. D., & Yadav, R. S. (2016). Pearl millet genetics and genomics. Frontiers in Plant Science.
• FAO (2018). Pearl Millet: Production and Utilization.