Sustainability assessment of the resistance of smooth bromegrass varieties to the causative agent of helminthosporiosis on an artificial infectious background
Keywords:Smooth bromegrass, leaf spotting, helminthosporiosis, disease monitoring, assessing progression of the disease
Smooth bromegrass (Bromopsis inermis Holub.) is widespread perennial grass and high quality feed. It is characterized by hight frost resistance. The main direction in breeding work is breeding of varieties with high seed productivity and with increased resistance to diseases. The research was carried out using an artificial infectious background in the immunology laboratory in FWRC FPA (previously, the All-Russian Williams Fodder Research Institute). This research took place in Lobnya, Mytishchi district, Moscow region, in 2018 -2020 years. Long-term phytosanitary monitoring of crops showed that the most common disease of this culture is brown leaf spot (helminthosporium). Seed germination decreases by 21-41% to this patgen. 16 samples of smooth bromegrass was planted in the artificial infectious background to determine their disease resistance in 2018 According to the study carried out, it was found that the disease reaches its peak at the stage of seed ripening. Sample # 2 and sample # 12 on average exceeded the standard variety Fakelny by 12% for resistance to pathogens of helminthosporiosis (among the studied samples, according to three-year data). Sample # 2 and sample # 12 can be recommended for inclusion in the breeding process to create modern intensive type varieties.
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