A seed treated with a fungal/bacterial antagonist combination and a seed assembly comprising a seed and a fungal/bacterial antagonist combination. The fungal/bacterial antagonist combination comprises a Trichoderma virens fungal antagonist and a Bacillus amyloliquefaciens bacterial antagonist for controlling plant pathogens as a biocontrol agent, bio-pesticide or bio-fungicide. In preferred embodiments, the invention produces an increase in plant yield. Control of early and late season stalk and root rot caused by fungi such as Fusarium, Phythium, Phytophthora and Penicillium in tomatoes, peppers, turf grass, soybeans, sunflower, wheat and corn is achieved.