As a kind of biocontrol bacteria, Trichoderma harzianum can be used to prevent plant diseases caused by pathogenic bacteria such as Pythium, Rhizoctonia solani, Fusarium, Rhizopus, Haloxylon, Sclerotinia and Sclerotium. Effects of Trichoderma harzianum in agriculture Competitive effect: Trichoderma harzianum can grow rapidly in the plant’s root and leaf circumference, seize the site of the plant body, form a protective cover, just like putting boots on the plant, prevent the pathogenic fungi from touching the root system and leaf surface. In order to protect the roots and leaves of plants from the above-mentioned pathogens, and ensure the plants can grow healthily. Heavy parasitism: Heavy parasitism refers to the complex process of identifying, contacting, entangling, penetrating, and parasitizing pathogenic bacteria in a series of consecutive steps. In the interaction between Trichoderma and pathogenic bacteria, the host mycelium secretes some substanc...