Strain of fungus Хк-1 Chaetomium olivaceum Cook et Ellis is a producer of microbiopreparation to decreasing of fusariosis on soybean

As a result of a screening of strains-antagonists from a collection of biological methods laboratory of VNIIMK to pathogen Fusarium sporotrichiella Bilai var. poae (Pk.) Wr. emend. Bilai was selected strain-producer of microbiopreparation a fungus Xk-1 Chaetomium olivaceum Cook et Ellis. Influence of the strain-producer of microbiopreparation, mechanism of a fungus activity to Fusariosis pathogen on soybean was studied. The experimental samples of a preparation were tested at artificial inoculation in laboratory conditions and in field. The results of researches are presented in this article. Treatment of soybean seeds of a cultivar Vilana with a water suspension of testing preparation does not influence negatively on germination, and promotes its increasing compared to control on 9%. Growth-stimulating impact of the strain-producer on soybean seedlings was ascertained. Length and weight of a root was influenced by the strain mostly. A mechanism of interrelation between strain-producer and a fusariosis pathogen on soybean was studied. An antibiotic action of the strain-producer on fusariosis pathogen was stated. In laboratory conditions, soybean seeds treatment by studied microbiopreparation demonstrated protected effect at artificial inoculation. Thus, in wet chambers, at fusariosis infection 58.6% in control, the maximal biological efficiency of microbiopreparation (59.0%) was determined at usage rate 3.0 liter per t, efficiency of etalon chemical preparation tetramethyltiuramdisulphid was 65.9%. At artificial inoculation of soybean seeds by fusariosis in soil (78.7%), biological efficiency of microbiopreparation was 33.9%, as the same of the chemical etalon tetramethyltiuramdisulphid - 13.6%. An average oecizing activity of the strain-producer (40.0%) to soybean was determined. In field trials, in year of fusariosis appearance on soybean, infection degree was 49.1% in control, and biological efficiency of seeds treatment with experimental sample of preparation was 28.7%, as the same of the chemical etalon tetramethyltiuramdisulphid 10.8%. The extra yield was 0.15 t per ha, at application of etalon tetramethyltiuramdisulphid - 0.13 t per ha. In industrial trials in two districts of Krasnodar region, at absence of soybean infection by fusariosis and other diseases, a positive influence of soybean seeds treatment by microbiopreparation on seed yield due to reduction of seed and soil infections as well as growth-stimulating action of the strain-antagonist.