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attack, parasitize and otherwise gain nutrition from other fungi. In addition to colonizing roots, Trichoderma spp. Used with permission of the American Phytopathological Society (Harman. 3: Colonization of root hairs of corn by the highly rhizosphere competent strain of T. However, most strains lack this ability.įig. Thus, if added as a seed treatment, the best strains will colonize root surfaces even when roots a meter or more below the soil surface and they can persist at useful numbers up to 18 months after application. Once they come into contact with roots, they colonize the root surface or cortex, depending on the strain. The most strongly rhizosphere competent strains can be added to soil or seeds by any method. Some strains are highly rhizosphere competent, i.e., able to colonize and grow on roots as they develop. They are favored by the presence of high levels of plant roots, which they colonize readily. The white areas do not contain spores, while the green areas are covered with dense masses of spores (conidia). 1: Cultures of Trichoderma harzianum strain T-22 (KRL-AG2) growing on potato dextrose agar. In soil, they frequently are the most prevalent culturable fungi.įig. are fungi that are present in nearly all soils and other diverse habitats. Harman, Cornell University, Geneva, NY 14456 ( Ascomycetes, Hypocreales, usually Hypocrea spp., are sexual anamorphs, this life stage is lacking or unknown for biocontrol strains)īy G. hamatum and other spp.ĭeuteromycetes, Moniliales (asexual classification system)