Efficiency of the microbiological products based on Bacillus subtilis and Trichoderna harzianum in protection of spring barley from diseases in the North-West of Russia

Abstract

The efficacy of microbiological plant protection specimens based on Bacillus subtilis (Vitapan, SP) and Trichoderna harzianum (Trikhotsin, SP) was studied on such spring barley diseases as a root rot and Helminthosporium leaf spot. The use of these biological products in the treatment of seeds and vegetative plants of spring barley was ineffective, namely a decrease in the development of root rot and helminthosprium disease did not exceed 35%. A greater protective effect was achieved when using studied preparations for treating seeds with a low degree of infection with the main pathogen of root rot. The use of Vitaplan in a tank mixture with reduced consumption rates of the chemical fungicides was less effective than pure chemicals with full consumption rates: the decrease was 17% for root rot and 12.7% for Helminthosporium leaf spot. Thus, it is advisable to use mixtures of chemicals with the Vitaplan as a biological for treatment of seeds with an average degree of infection by root rot pathogens and a predicted moderate development of Helminthosporium disease. spring barley, biological plantprotecting agents, root rot, protective efficiency.