This is the first report on its occurrence in vermicompost. The reason for the presence of P. polymyxa in the vermicompost may be due to worm-associated microflora or to soil bedding/plant debris used in the different stages of vermicomposting [41]. It has considerable economic importance in the agricultural and horticultural fields as an efficient plant growth-promoting rhizobacterium, biofertilizer and antagonist of various root pathogens [42]. P. polymyxa has specific properties like the fermentation of mannitol, lactose and galactose and production of hydrogen sulfide gas during the TSI test [43]. Similar results were observed in the present investigation.