Abstract
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.
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