The efficiency of the microbial preparations Vitaplan LP and Trikhotsin LP, which are based on loose powders of Bacillus subtilis and Trichoderna harzianum cells, respectively, for the protection of spring barley from root rot and helminthosporium leaf spots in the northwest of the Russian Federation has been studied. It was shown that both preparations had a small effect on spring-barley diseases when used for the treatment of seeding material or vegetative plants. The development of helminthosporium-fusarium root rot and helminthosporium leaf spots was reduced by 35%. A higher biological and agricultural effect was achieved with the use of a drug for the treatment of seeds with a low degree of infection by the main root-rot pathogen. Compensation for reduced doses of chemical fungicides with Vitaplan LP had less of an effect than full doses of these fungicides: the effect on root rot and helminthosporium leaf spots was reduced by 17 and 12.7%, respectively. The use of mixtures of Vitaplan LP with chemical preparations is advisable at a medium degree of seed contamination with root-rot pathogens and a predicted moderate development of helminthosporium leaf spots.

微生物制剂Vitaplan LP和Trikhotsin LP的效率是基于枯草芽孢杆菌和哈茨木霉的散粉在俄罗斯联邦西北部，分别研究了用于保护春大麦免受根腐病和蠕孢子虫叶斑侵害的细胞。结果表明，当用于处理播种材料或营养植物时，两种制剂对春季大麦病的影响均很小。蠕虫孢-镰刀菌根腐烂和蠕虫孢子叶斑的发育减少了35％。通过使用一种药物来处理主要根腐病病原体低感染度的种子，可以获得更高的生物学和农业效果。用Vitaplan LP补偿减少剂量的化学杀菌剂的效果要小于全部剂量的杀菌剂：对根腐病和蠕虫孢子叶斑的影响分别降低了17％和12.7％。