Pearl millet (Pennisetum glaucum), or bajra, cultivated in arid and semi-arid dryland zones, faces major yield losses from destructive oomycetes and fungal pathogens, notably Downy Mildew / Green Ear (Sclerospora graminicola), Ergot (Claviceps fusiformis), and Rust (Puccinia penniseti). Downy mildew transforms flowering earheads into leafy green vegetative structures (green ear), causing total grain loss. Applying Bacillus subtilis as a seed coating or foliar spray at tillering and boot leaf stage establishes an antagonist biological layer over foliage, earheads, and root zones. The bacteria colonize host surfaces, producing cyclic lipopeptides (surfactin, iturin, fengycin) that disrupt zoospore motility and stop fungal spore germination.

Beyond disease control, Bacillus subtilis serves as a key plant growth-promoting rhizobacterium (PGPR) in dryland millet farming. It solubilizes fixed soil phosphorus, secretes siderophores for iron mobilization, and produces growth regulators that encourage deep root branching. Enhanced root health supports drought resilience, improves earhead length, and increases grain filling. Regular application ensures clean, high-yielding bajra harvests.

Importance of Bacillus subtilis in Pearl Millet Cultivation

Pearl millet productivity depends on rapid root establishment, vigorous tillering, and efficient nutrient uptake throughout vegetative growth and grain development. Healthy roots improve water absorption, help plants tolerate drought, and ensure proper earhead formation.

Bacillus subtilis rapidly colonizes the rhizosphere and competes with harmful fungi and bacteria for nutrients and space. It also produces natural antimicrobial metabolites that suppress disease-causing organisms while promoting beneficial microbial populations.

Healthy roots encourage more productive tillers, larger earheads, improved grain development, and better fodder production.