The effectiveness of using the laboratory samples based on bacteria of the genus Streptomyces on peas in the conditions of the Volga-Vyatka region

Data on productivity, fungal diseases and the quality of seed peas grown on sod-podzolic medium-clay soil in 2021–2023 using pre-sowing seed treatment separately and in combination with plant vegetation treatment with experimental preparations based on local strains of the genus Streptomyces (A4 and 8A1-3) are presented. The comparison drugs were the chemical fungicide Pioneer, KS and the biological drug Pseudobacterin-2, J. The assessment of the biological effectiveness (BE) of the drugs was carried out on cultivars of peas of various morphotypes bred by the FARC North-East: ‘Falensky yubileiny’, ‘Falensky usaty’, ‘Falensky kormovoy’. The biological effectiveness of all tested preparations in protecting peas from root rot and ascochitosis was determined by the weather conditions of the year of research. In 2021, a significant decrease in the development of root rot compared with the control (38.4 %) was facilitated by seed treatment with a preparation based on S. antimycoticus 8A1-3 strain (29.0 %). A significant reduction in the development of pea root rot in 2022 was achieved by seed treatment with the chemical fungicide Pioneer (by 9.1 %), the reference bio-drug Pseudobacterin-2 (by 9.9 %) and the test strain S. antimycoticus 8Al-3 (by 7.1 %). In protecting peas from ascochitosis in 2022, the strain Streptomyces A4 (BE 72.7 %) proved itself as a Pioneer chemical fungicide (BE 72.7 %), and the strain Streptomyces 8A1-3 (BE 84.1 %) significantly surpassed them in effectiveness. The effect of drugs on the yield of peas in the years of research (HTC = 0.77–0.83 with an average long-term HTC = 1.4) was estimated as insignificant. Treatment with both experimental and commercial preparations of seeds and vegetative plants did not adversely affect the grain size and the content of crude protein in it. The ‘Falensky usaty’ was distinguished among the studied cultivars by large seeds: the mass of 1000 grains was 258.8±18.5 g. The ‘Falensky kormovoy’ and the ‘Falensky jubileiny’ cultivars proved to be medium-seeded ones (174.7±23.1 and 147.9±37.1 g, respectively). The content of crude protein in grain was negatively affected by the development of root rot on peas (correlation coefficient r =-0.77). The maximum crude protein content was recorded during the joint treatment of seeds and plants with a preparation based on S. castalarensis A4 (24.0±2.6 %) in the ‘Falensky jubileiny’ cultivar, with Pseudobacterin-2 (23.1±2.0 %) in the ‘Falensky kormovoy’ cultivar, with a preparation based on S. antimycoticus 8A1-3 (21.1±1.7 %) in the ‘Falensky usaty’ cultivar.