International Symposium on Cereal Leaf Blights 2019 | University College Dublin, Ireland | 22-24 May 2019

Impact of pre-crop and pre-pre-crop on the development of winter wheat leaf diseases

Biruta Bankina*
Latvia University of Life Sciences and Technologies

Irina Arhipova
Latvia University of Life Sciences and Technologies

Poster Presentation
Cultural Management, Fungicide Resistance and Epidemiology

Atrium, UCD O'Brien centre for Science
Poster 20

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Winter wheat leaf diseases cause serious yield losses globally. Agronomic practice is considered an important tool to reduce the development of these diseases. The aim of the present study is to evaluate the impact of a pre-crop and a pre-pre-crop on the severity of wheat leaf diseases under different soil tillage methods. Observations were made in a field experiment established at the Study and Research farm “Peterlauki” of the Latvia University of Life Sciences and Technologies in 2008. The data obtained from 2012 to 2018 (except 2014) were analysed. The development of winter wheat leaf diseases was assessed in a two-factorial experiment: 1 – soil tillage (ploughing; disc harrowing); 2 – different pre-crops and pre-pre-crops (wheat, wheat; wheat, oilseed rape; oilseed rape, wheat; barley, faba beans; wheat, faba beans). Severity of diseases was determined 5–7 times during vegetation, from BBCH 33 till 77, and the AUDPC (area under diseases progress curve) was calculated. Tan spot (Pyrenophora tritici-repentis) and Septoria leaf blotch (Zymoseptoria tritici) were the most widespread diseases during the whole investigation period; however, the severity of diseases differed depending on meteorological conditions. The levels of mildew (Blumeria graminis) and yellow rust (Puccinia striiformis) were too low to evaluate the influence of agronomic practices. Soil ploughing slightly decreased tan spot development but did not influence the level of Septoria leaf blotch. Continuous wheat essentially increased the level of tan spot, but differences between other variants of crop rotation were not significant. Crop rotation scheme had no effect on the development of Septoria leaf blotch. Crop rotation and soil tillage methods influenced the level of winter wheat leaf diseases, but a complex approach is required to control these diseases.

Acknowledgments: The research was supported by the grant from the Ministry of Agriculture of the Republic of Latvia “Influence of minimal soil tillage on its fertility maintenance, development and distribution of pests as well as crops’ yield and quality in resowings”.