Yield increases due to fungicide control of leaf blotch diseases in wheat and barley as a basis for IPM decision-making
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Yield increases due to fungicide control of leaf blotch diseases in wheat and barley as a basis for IPM decision-making in the Nordic-Baltic region Marja Jalli & Janne Kaseva & Björn Andersson & Andrea Ficke & Lise Nistrup-Jørgensen & Antanas Ronis & Timo Kaukoranta & Jens-Erik Ørum & Annika Djurle
Accepted: 8 July 2020 # The Author(s) 2020
Abstract Fungal plant diseases driven by weather factors are common in European wheat and barley crops. Among these, septoria tritici blotch (Zymoseptoria tritici), tan spot (Pyrenophora tritici-repentis), and stagonospora nodorum blotch (Parastagonospora nodorum) are common in the Nordic-Baltic region at variable incidence and severity both in spring and winter wheat fields. In spring barley, net blotch (Pyrenophora teres), scald (Rhynchosporium graminicola, syn. Rhynchosporium commune) and ramularia leaf spot (Ramularia collo-cygni) are common Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10658-020-02075-w) contains supplementary material, which is available to authorized users. M. Jalli (*) : J. Kaseva : T. Kaukoranta Natural Resources Institute Finland (Luke), Tietotie 4, FI-31600 Jokioinen, Finland e-mail: [email protected] B. Andersson : A. Djurle Swedish University of Agricultural Sciences, Almas Allé 5, SE-75007 Uppsala, Sweden A. Ficke Bioforsk, Høgskoleveien 7, NO-1430, Ås, Norway L. Nistrup-Jørgensen Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
yield limiting foliar diseases. We analysed data from 449 field trials from 2007 to 2017 in wheat and barley crops in the Nordic-Baltic region and explored the differences in severity of leaf blotch diseases between countries and years, and the impact of the diseases on yield. In the experiments, septoria tritici blotch dominated in winter wheat in Denmark and southern Sweden; while in Lithuania, both septoria tritici blotch and tan spot were common. In spring wheat, stagonospora nodorum blotch dominated in Norway and tan spot in Finland. Net blotch and ramularia leaf blotch were the most severe barley diseases over large areas, while scald occurred more locally and had less yield impact in all countries. Leaf blotch diseases, with severity >50% at DC 73–77, caused an average yield loss of 1072 kg/ha in winter wheat and 1114 kg/ha in spring barley across all countries over 5 years. These data verify a large regional and yearly variation in disease severity, distribution and impact on yield, emphasizing the need to adapt fungicide applications to the actual need based on locally adapted risk assessment systems. Keywords IPM . Parastagonospora nodorum . Pyrenophora teres . Pyrenophora tritici-repentis . Ramularia collo-cygni . Rhynchosporium graminicola . Risk assessment . Yield loss Zymoseptoria tritici
A. Ronis Lithuanian Research Centre for Agriculture and Forestry, Institute of Agriculture, Instituto ave. 1, LT-58344 Kėdainiai, Lithuania
Introduction
J.1 mm) from growth stage DC 32 onwards, are needed before application of fungicide against STB is recommen
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