Antagonism (phytopathology)
Encyclopedia
In phytopathology
Phytopathology
Plant pathology is the scientific study of plant diseases caused by pathogens and environmental conditions . Organisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids, virus-like organisms, phytoplasmas, protozoa, nematodes and parasitic plants...

, antagonism refers to the action of any organism that suppress or interfere the normal growth and activity of a plant pathogen, such as the main parts of bacteria
Bacteria
Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...

 or fungi.

These organisms can be used for pest control and are referred to as ``Biological Control Agents´´. They may be predators, parasites, parasitoides, or pathogens that attack harmful insect, weed or plant disease.

'Antagonism - Mechanism'

Antibiosis example- enzymes, toxins, antibiotics.
Direct parasitism example- biotrophic or necrotrophic.
competition example- for nutrients.
Induced resistance(indirect).
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