DEVELOPMENT CHARACTERISTICS AND BIOLOGICAL CONTROL METHODS FOR HELMINTHOSPORIUM SPOTS OF SPRING BARLEY

DOI 10.12737/2782-490X-2025-4-4-46-52 УДК 632.4:633.16

Authors

  • Radik Ilyasovich Safin Kazan State Agrarian University, Kazan, Russia.
  • Nikita Andreevich Medvedev Kazan State Agrarian University, Kazan, Russia.

Keywords:

plant diseases, mycoses, leaf spots, Helminthosporium wilt, biological control, biological preparations, spring barley

Abstract

The species composition of helminthosporium leaf spots on two-row spring barley was assessed. It was established that the predominant fungal infection of this type on the crop during the period 2022-2025 was dark brown leaf spot
(pathogen: Bipolaris sorokiniana (Sacc.) Shoemaker). The effect of using endophytic bacteria-based biopreparations on the
development of helminthosporium leaf spots on spring barley of Raushan variety was assessed under field conditions (gray
forest medium loamy soil) from 2022-2024. The use of a biological product based on an endophytic bacterium (Bacillus
mojavensis PS-17) for seed treatment and crop spraying has a significant positive effect on reducing the incidence of all
helminthosporium leaf spot diseases in spring barley (biological efficacy against dark brown leaf spot was 21.7%; net leaf
spot – 35.1%). Moreover, a yield increase of 0.87 t/ha or 17% compared to the untreated variant, was observed. In 2025,
under conditions favorable for the development of leaf spot diseases, trials of the effectiveness of mixed biological products (endophytic bacteria mixed with succinic acid) with single and double applications were conducted on the Pamyat
Chepeleva spring barley variety. It was found that the use of such preparations, especially when applied twice, helps reduce leaf surface damage by dark brown spot and net spot. The biological control effectiveness was 20.8-21.9% for the
former and 18.3-19.4% for the latter. Application of a preparation based on succinic acid and Bacillus spp. KS-63 AU
resulted in an increase in spring barley yield by 0.55 t/ha (19%) compared to the control. The research demonstrated the
potential of using biological preparations based on endophytic bacteria as biological control methods, including in organic
spring barley production.

For citation: Safin R.I., Medvedev N.A. Development characteristics and biological control methods for helminthosporium spots of spring barley. Agrobiotechnologies and digital farming. 2025; 4(16). 46-52 p. http://
dx.doi.org/10.12737/2782-490X-2025-4-4-46-52

Author Biographies

Radik Ilyasovich Safin, Kazan State Agrarian University, Kazan, Russia.

Doctor of Agricultural Sciences, Professor, Corresponding Member of the Academy of Sciences of the Republic of Tatarstan, Head of the Department of General Agriculture, Plant Protection and Breeding, e-mail: radiksa12@mail.ru, ORCID: https://orcid.org/0000-0001-6276-5728

Nikita Andreevich Medvedev, Kazan State Agrarian University, Kazan, Russia.

Postgraduate Student, Senior Lecturer of the Department of General Agriculture, Plant Protection and Breeding, e-mail: nikitamedvedev170217@mail.ru

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Published

2026-07-22