Abstract

Rhizobacteria are plant root colonizers mainly found in soil naturally and impact plant growth and nourishment. When inoculated with rhizobacterial strains at an early growing stage, improve vigor and biomass production influence by the directly influenced shoot and root growth. Plants such as forest trees, crops, and horticultural crops inoculated with rhizobacteria may induce multiple effects on plant growth as on the enhancement of seedling germination. Plant stands health, vigor, height, root size, shoot, root biomass, early bloom, chlorophyll content, and enhanced nodulation in legumes. The beneficial influence of rhizobacteria on the nutrient uptake, yield, and growth of plants is diversifying mechanism. To fix nitrogen in legumes, they increase other nutrient supply, e.g., iron, copper, sulphur, and phosphorus, induce production of plant hormones, increase the activity of beneficial microbes, and act as antagonist disease-causing fungi, bacteria and check on the population of insect pests. New era new needs, so rhizobacteria gained importance for sustainable agriculture without altering the environment. Billions of dollars are being invested in the biocontrol research and increasing the number of biocontrol agents being commercialized for various plant crops. In this review, we have discussed multiple bacteria which act as biocontrol agents and their mechanisms