Winter wheat leaf blotches development depending on fungicide treatment and nitrogen level in two contrasting years
Laen...
Kuupäev
2021
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
Tan spot (caused by Pyrenophora tritici-repentis) and Septoria tritici blotch (caused
by Zymoseptoria tritici) are the most widespread winter wheat leaf diseases in Latvia. The aim
of the present research was to clarify the development of leaf blotches on winter wheat depending
on fungicide treatment schemes under four nitrogen rates. A two-factorial trial was conducted at
the Research and Study farm “Pēterlauki” (Latvia) of Latvia University of Life Sciences and
Technologies. For this study, data from the 2018/2019 and 2019/2020 growing seasons was used.
Four schemes of fungicide application and an untreated variant, as well as four nitrogen rates
(N120, N150, N180, and N210 kg ha-1
) were used. The total disease impact during the vegetation
period was estimated by calculating the area under the disease progress curve (AUDPC). The
severity of leaf blotches in winter wheat leaves differed significantly during both vegetation
seasons. Tan spot was the dominant disease in 2019 (18.7% in untreated variant). The
development of tan spot was reduced by fungicide treatment; however, only in 2019, the influence
of fungicide was significant. Septoria tritici blotch was the dominant disease in 2020 (11.4% in
untreated variant), and its development was decreased by fungicides. Nitrogen fertilizer rate had
no significant effect on the development of Septoria tritici blotches. Yield harvested in 2020 were
significantly higher than those in 2019 (on average 5.23 t ha-1
in 2019, 8.40 t ha-1
in 2020). The
using of fungicides provided significant increase of yield but there were no significant differences
among fungicide treatment schemes.
Kirjeldus
Received: January 31st, 2021 ; Accepted: December 1st, 2021 ; Published: December 4th, 2021 ; Correspondence: agrita.svarta@llu.lv
Märksõnad
winter wheat, Pyrenophora tritici-repentis, Zymoseptoria tritici, values of AUDPC, control, articles