1. pathogen-any disease-producing agent (especially a virus or bacterium or other microorganism). microorganism, micro-organism-any organism of microscopic size.infectious agent, infective agent-an agent capable of producing infection. Translations.. pathogen-any disease-producing agent (especially a virus or bacterium or other microorganism). microorganism, micro-organism-any organism of microscopic size.
Agricultural Tools. The Agricultural Tools ClipArt gallery offers 195 illustrations of hand tools such as plows, pitchforks, insecticide sprayers, rakes, and rollers.
They use pointed sticks, hoes, or other hand tools to make holes in the soil to plant their seeds, tubers, and cuttings. This is a labor intensive but not capital intensive form of farming. Pesticides and herbicides are not used by traditional subsistence horticulturalists.