Fuente: WIPO "tomato" Disclosed are Priestia megaterium (Pm) strains, cultures, supernatants, filtrates, extracts, and/or volatiles that are or are derived from P. megaterium strain PM10 having deposit accession number NRRL B-68352, strain PM11 having deposit accession number NRRL B-68353, or a mixture thereof. Also disclosed are methods for using such Pm strain, culture, supernatant, filtrate, extract, and/or volatile to enhance plant growth, and/or increase crop yield, and/or prevent or control pest growth and/or activity. Bioactive compositions comprising such Pm strain, culture, supernatant, filtrate, extract, and/or volatile may optionally comprise a carrier, diluent, and/or adjuvant.