The present invention provides a composition comprising a biologically pure culture of a Paenibacillus sp. strain or a cell-free preparation thereof comprising a fusaricidin and a tridecaptin; wherein the fusaricidin is produced with a fusaricidin synthetase gene of fusA encoded by a DNA sequence exhibiting at least 90.5% sequence identity to SEQ ID NO: 3; and the tridecaptin is produced with a nonribosomal peptide synthetase (NRPS) gene of triE encoded by a DNA sequence exhibiting at least 90.0% sequence identity to SEQ ID NO: 7. Also provided are methods of treating an agricultural plant to control a disease and methods of increasing the vigor and/or crop yield of an agricultural plant with the disclosed compositions.