Cultivated across 7 million hectares of Rajasthan, Gujarat, and Haryana as the primary food and fodder crop of the arid and semi-arid northwest India.
Pearl Millet : 5 Major Threats and Their Control
For guidance only. Does not replace local expert advice. Check region-specific recommendations with your nearest KVK or State Agriculture Department before buying seeds, fertilizers, or pesticides.
1. Downy Mildew (Green ear disease)
(Sclerospora graminicola)
The Threat:
- Downy mildew is the most historically devastating fungal disease of pearl millet in India.
- It infects seedlings systemically through roots, turning young plants into white sporulating masses within 2–3 weeks.
- Spreads rapidly through airborne spores in humid conditions, damaging entire fields quickly.
- Continuous cultivation of susceptible hybrids increases soil inoculum and disease severity.
- Causes 10–40% yield loss, higher in epidemic years.
The Solution:
- Treat seed with Metalaxyl (systemic fungicide) 35 WS @ 3 g/kg. This treatment provides complete protection to the seedling against primary soil-borne infection for the first 3–4 weeks.
- Use multi-genic resistant varieties that carry broad-spectrum resistance to current pathogen populations.
- Avoid using seed from infected fields as oospores survive in the seed coat and will reinfect the next crop.
- Rotate crops and avoid continuous bajra cultivation on the same field.
2. Ergot Disease
(Claviceps fusiformis)
The Threat:
- Ergot replaces grains with curved, honeydew-coated sclerotia containing toxic alkaloids (ergotamine and related compounds).
- These toxins cause ergotism — leading to convulsions and gangrene in severe cases.
- In livestock, contaminated fodder causes reduced milk yield, reproductive failure, and even death.
- Favoured by cool, cloudy weather during flowering, especially in late-sown crops.
The Solution:
- Sow on time-the primary tactic is to ensure flowering occurs during warmer, drier conditions before the ergot-favourable weather window. Avoid cool, humid conditions.
- Spray Carbendazim (broad-spectrum, systemic benzimidazole fungicide) 50 WP @ 0.5 g/litre at early heading as a preventive measure.
- Remove and destroy infected plants before sclerotia mature. Remove and destroy visibly infected plants before sclerotia mature and fall to the ground — they form the inoculum for the following season
- Do not feed contaminated grain or fodder to livestock.
- Use certified, ergot-free seed.
3. Shoot Fly
(Atherigona approximata)
The Threat:
- Bajra shoot fly damages are similar to sorghum shoot fly but specific to pearl millet.
- Larva bores into the central growing point, causing “deadheart” (death of central shoot).
- Most severe in late-sown crops during peak fly population (July–August).
- Also attacks tiller buds, reducing the plant’s ability to compensate through tillering.
The Solution:
- Early sowing is the most effective and cost-free management tactic.
- Treat seed with Imidacloprid (neonicotinoid systemic insecticide) 70 WS @ 7 g/kg before sowing to protect the seedling through the most vulnerable first 3 weeks.
- Use early-maturing varieties to reduce exposure period— shorter exposure during the peak fly period translates directly to lower deadheart incidence.
- Monitor fields between 7–21 days after emergence for deadheart incidence symptoms and record the incidence percentage to decide whether intervention is needed.
4. Drought (Mid-Season and Terminal)
(Mid-Season and Terminal)
The Threat:
- Rajasthan’s monsoon is highly erratic, with long dry spells after initial rainfall.
- Moisture stress at boot stage reduces panicle exsertion.
- Drought at heading leads to floret sterility and poor grain set.
- This is a recurring issue in many districts, especially when rains fail in August.
The Solution:
- Practice conservation tillage — minimum disturbance, crop residue retention on the soil surface — to maximise the storage of rainfall within the soil profile between rain events.
- Sow on ridges to improve water availability to roots.
- Grow recommended short-duration varieties fitting within the reliable rainfall window.
- Maintain field bunds to reduce runoff and conserve moisture.
5. Iron / Zinc Deficiency
The Threat:
- Calcareous, high-pH soils reduce availability of iron and zinc.
- Iron deficiency causes interveinal chlorosis — young leaves turn yellow with green veins.
- Zinc deficiency affects enzyme activity, protein synthesis, and grain filling.
- Reduces both crop yield and grain nutritional quality.
- A major concern in regions where bajra is a staple food.
The Solution:
- Spray ferrous sulphate (FeSO₄) (micronutrient fertilizer ) @ 0.5% at 3-week intervals after symptom appearance , thoroughly wetting the young leaves.
- Apply Zinc Sulphate (ZnSO₄) 21% @ 25 kg/ha as basal dose where deficiency is confirmed.
- Grow biofortified varieties — Example: Dhanashakti and HHB-299. They accumulate higher iron and zinc in grain regardless of soil nutrient levels, addressing both agronomic performance and human nutrition simultaneously.
Additional Reads
Ph.D. in Agricultural Engineering.