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Biocontrol Agents Against Plant Pathogens

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Mycorrhiza (arbuscular mycorrhizal fungi)

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Enhances plant resistance to soil-borne pathogens. Modes of action include improved nutrient uptake, competition with pathogenic microbes, and enhanced plant immune response.

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Gliocladium virens

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Targets seed and soil-borne pathogens such as Pythium. Mode of action includes mycoparasitism, antibiosis, and competition for nutrients and space.

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Agrobacterium radiobacter (strain K84)

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Targets Agrobacterium tumefaciens, the causative agent of crown gall disease. Mode of action predominantly involves antibiosis through production of agrocin 84.

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Burkholderia cepacia

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Targets fungal pathogens such as Rhizoctonia and Pythium. Modes of action involve antibiosis, niche exclusion, and induced systemic resistance in plants.

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Streptomyces griseoviridis

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Targets root pathogens such as Fusarium, Rhizoctonia, and Pythium. Mode of action includes antibiosis and the production of metabolites that suppress the growth of the pathogens.

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Bacillus thuringiensis

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Targets various lepidopteran, coleopteran, and dipteran pests. Modes of action include gut paralysis followed by sepsis due to crystalline endotoxin proteins.

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Metarhizium anisopliae

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Targets a wide range of insects, including termites, thrips, and locusts. Mode of action involves cuticle penetration and utilization of internal host tissues.

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Ulocladium oudemansii

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Targets Botrytis cinerea, the agent of gray mold. Mode of action includes competition for space and nutrients, as well as possibly antibiosis.

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Ampelomyces quisqualis

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Targets powdery mildew fungi. Mode of action includes hyperparasitism, where the biocontrol agent grows directly on the pathogen, debilitating its structure and function.

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Coniothyrium minitans

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Targets Sclerotinia sclerotiorum, causing white mold. Mode of action includes mycoparasitism, in which it parasitizes the fungal resting structures called sclerotia.

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Trichoderma spp.

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Targets a range of fungal pathogens. Modes of action include competition, mycoparasitism, and enzyme production that breaks down the cell walls of the pathogens.

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Pseudomonas fluorescens

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Targets root pathogens such as Fusarium and Pythium. Modes of action include antibiosis, siderophore production, and induced systemic resistance.

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Pseudomonas chlororaphis

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Targets Fusarium and other fungal pathogens. Modes of action include antibiosis due to the production of phenazines, induced systemic resistance, and competition for nutrients.

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Bacillus subtilis

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Combats a variety of pathogens including Fusarium and Rhizoctonia. Mode of action comprises antibiosis, enzyme secretion that degrades pathogenic fungal cell walls, and induced systemic resistance.

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Beauveria bassiana

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Targets insects such as whiteflies, aphids, and beetles. Mode of action includes infection through the cuticle, followed by growth inside the host, leading to disease and death.

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Steinernema carpocapsae

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Targets various insect larvae. Mode of action involves entering the host body, releasing symbiotic bacteria (Xenorhabdus spp.), and killing the host through bacterial toxins.

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Pythium oligandrum

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Targets pathogens like Botrytis and Phytophthora. Mode of action includes competition, antibiosis, and induction of plant resistance mechanisms.

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Paecilomyces lilacinus

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Targets nematodes, especially root-knot nematodes. Mode of action includes egg parasitism, where the fungus invades, parasitizes, and ultimately destroys nematode eggs.

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Lecanicillium lecanii

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Targets scale insects, whiteflies, aphids, and thrips. Mode of action includes spore germination on the insect, cuticle penetration, and subsequent internal colonization.

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Heterorhabditis bacteriophora

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Targets soil-dwelling insects. Mode of action includes infection through the insect's natural body openings, followed by symbiotic bacteria (Photorhabdus spp.) release and subsequent insect death.

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