Combining Effective Strains of Trichoderma harzianum and Solid Matrix Priming to Improve Biological Seed Treatments

In all crop-pathogen combinations, Trichoderma strains increased stands relative to the untreated control and were as effective as the chemical fungicides, even in the absence of solid matrix priming. Priming of seeds treated with Trichoderma strains increased plant stands in solid infested with F. graminearum and P. ultimum but not in soils infested with R. solani or S. rolfsii. In soils infested with P. ultimum, strain T95 generally gave the poorest results, T12 was intermediate, and the progeny strains (22 and 106) gave improved stands