Biological Control of Plant Pathogens: Research, Commercialization, and Application in the USA

Fig. 2. Example in vitro inhibition assay. Different bacterial isolates are tested for their ability to inhibit the growth of Pythium spp. SF2, a soilborne plant pathogen that can cause damping-off of corn and soybean seedlings. Zones of growth inhibition can be detected around strains placed at two of the four positions on the plate.



Image from Plant Health Progress article:
Biological Control of Plant Pathogens: Research, Commercialization, and Application in the USA