Efficiency of application of fungicides for spring wheat protection against root rots

Infestation of grain crops by common root rot in the conditions of Ural Federal District was studied. In previous years, infestation of wheat by Bipolaris sorokiniana pathogens predominated, but in recent years, there has been a gradual shift in the structure of microbiocenosis with the prevalence of Fusarium spp. fungi. With zero and minimum grain crop tillage technologies (no-till, mini-till), chemical disinfection of seeds and fungicidal crop treatment becomes imperative. The efficiency and feasibility of using fungicides was studied on the seeds of spring wheat, cultivar Omskaya 36. Field experiments were conducted in the conditions of Kurgan region on leached chernozem in the period of 2009-2017. Yield losses caused by phytopathogenic fungi were largely determined by the hydrothermal conditions during the growing season. The largest damage to wheat productivity was caused by diseases of this group during dry periods (11% in years with satisfactory growing conditions, 22% in extremely dry years). It was discovered that the approach to protecting seeds from infections should be differentiated. Batches of seeds with high contamination by root rot pathogens are subject to mandatory chemical disinfection. Application of seed disinfectants based on two active agents is effective on wheat seeds infected by root rot pathogens over 15%, with the predominance of fungi genus Fusarium spp. Economic efficiency from the use of single-component seed disinfectants (tebuconazole, triticonazole) was 8-9%. When seeds were treated with seed disinfectants based on two active agents, the yield increased by 1416%. The use of systemic seed disinfectants is not recommended on relatively healthy seed material. It is more appropriate to use biological fungicide based on Bacillus subtilis.

spring wheat, seed disinfectants, biological efficiency, root rot, yield

1. Abelentsev V.I. Vozmozhnosti sovremennykh protravitelei semyan zernovykh kul’tur [Possibilities of modern seed disinfectants of grain crops]. Zashchita i karantin rastenii [Board of Plant Protection and Quarantine], 2011, no. 2, pp. 19–21. (In Russian).

2. Zdrozhevskaya S.D., Grishechkina L.D. Vliyanie pogodnykh uslovii na effektivnost’ protravitelei [Infl uence of weather conditions on the effectiveness of disinfectants]. Zashchita i karantin rasteni [Board of Plant Protection and Quarantine], 2019, no. 2. pp. 11–12. (In Russian).

3. Tyuterev S.L. Mekhanizmy deistviya fungitsidov na fi topatogennye griby [The mechanisms of action of fungicides on phytopathogenic fungi]. St. Petersburg, IPK «Niva» Publ., 2010, 172 p. (In Russian)

4. . 4. Zernovye kul’tury (vyrashchivanie, uborka, dorabotka i ispol’zovanie) [Grains (cultivation, harvesting, refi nement and use)]. Under the general editorship of D. Shpaara. Moskow, ID OOO «DLV AGRODELO» Publ., 2008, vol. 2, 656 p. (In Russian).

5. Toropova E.Yu., Vorob’eva I.G., Mustafi na M.A., Selyuk M.P. Griby roda Fusarium v Za-padnoi Sibiri [Fungi of Fusarium genus on wheat grains in Western Siberia]. Zashchita i karantin rastenii [Board of Plant Protection and Quarantine], 2019, no. 1, pp. 20–23. (In Russian).

6. Porsev I.N. Adaptivnye fi tosanitarnye tekhnologii vozdelyvaniya sel’skokhozyaistvennykh kul’tur v usloviyakh Zaural’ya. Monografi ya [Adaptive phytosanitary technologies of cultivation of agricultural crops in the conditions of Zauralye]. Edited by V.A. Chulkinoi. Shadrinsk, OGUP «Shadrinskii dom pechati» Publ., 2009. 320 p. (In Russian).

7. Kolomiets T.M., Pankratova L.F. Patogennyi kompleks vozbuditelei kornevoi gnili pshenitsy v raznykh regionakh Rossii [Pathogenic complex of pathogens of root rot of wheat in different regions of Russia]. Zashchita i karantin rastenii. [Board of Plant Protection and Quarantine], 2016, no. 2, pp. 37–40. (In Russan).

8. Kekalo A.Yu., Nemchenko V.V., Zargaryan N. Yu., Tsypysheva M.Yu.. Zashchita zernovykh kul’tur ot boleznei [Protection of grain crops from diseases]. Kurtamysh, «Kurtamyshskaya tipografi ya» Publ., 2017, 172 p. (In Russian).

9. Vlasenko N.G. K voprosu ob agrotekhnologiyakh voobshche i fi tosanitarnykh tekhnologi yakh v chastnosti [On the issue of agricultural technologies in general and phytosanitary technologies in particular]. Vestnik zashchity rastenii [Plant Protection News], 2008, no. 2, pp. 3–10. (In Russian).

10. Glinushkin P, Akimov T.A., Beloshapkina O. O., Molnar J., Sycheva I. I., Temirbekova S.K., Kvitko A.V., Dorozhkina L.A., Startsev V.I., Pestsov G.V., Spiridonov Y.Y., Batalova G. A., Zakharenko V.A. Fungicidal Activity of Seed Disinfectants Against Root Rot of Wheat in Various Types of Soils. Entomology and Applied Science Letters, 2018, vol. 5, no. 2, pp. 101–107

11. Sidorova T.M., Asaturova A.M., Khomyak A. I. Biologicheski aktivnye metabolity Bacillus subtilis i ikh rol’ v kontrole fi topatogennykh mikroorganizmov [Biologically active metabolites of Bacillus subtilis and their role in the control of phytopathogenic microorganisms]. Sel’skokhozyaistvennaya biologiya [Agricultural Biology], 2018, vol. 53, no. 1, pp. 29–37. (In Russian). DOI: 10.15389/agrobiology. 2018.1.29 rus

12. Glinushkin A.P., Sokolov M.S., Toropova E.Yu. Fitosanitarnye i gigienicheskie trebovaniya k zdorovoi pochve [Phytosanitary and hygienic requirements for healthy soil]. Moskow, «Izdatel’stvo Agrorus», 2016, 288 p. (In Russian).