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

Occurrence monitoring on Parastagonospora spp. and Zymosetoria tritici of wheat and triticale under climatic conditions of Poland.

Sławomir Bartosiak*
Plant Breeding and Acclimatization Institute-National Research Institute

Ewa Bartosiak
Plant Breeding and Acclimatization Institute-National Research Institute

Edward Arseniuk
Plant Breeding and Acclimatization Institute-National Research Institute

Poster Presentation
Cultural Management, Fungicide Resistance and Epidemiology

Atrium, UCD O'Brien centre for Science
Poster 11

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The most common wheat and triticale septoria leaf spot pathogens in eastern Europe are: Mycosphaerella graminicola (Fuckel) (anamorph: Zymoseptoria tritici (Desm.) and Phaeosphaeria nodourm (E. Müller) (anamorph: Parastagonospora nodourm (Berk.). Phaeosphaeria avenaria
(G. F. Weber) (anamorph: Parastagonospora avenae (A. B. Frank) primarily was oat and rye based fungus. However, over time P. avenae special forms pathogenic to wheat and triticale have emerged. In 1980s the most common fungus among septoria diseases in eastern Europe appeared to be P. nodorum. Nevertheless, a shift in prevalence from P. nodorum to Z. tritici was observed over time in certain regions of Europe.

Spatial distribution and incidence frequency of pathogens is not constant, therefore monitoring of pathogens occurrence is the first necessary step to optimise breeding programs priorities. The aim of this study was to examine Parastagonospora spp. and Z. tirtici severity and occurrence on wheat and triticale varieties to septoria leaf spot - LS and glume blotch - GB. Field experiments were established at 7 locations in various geographical regions of Poland. In each location a nursery consisted of 10 - winter wheat and 10 - winter triticale varieties was established to quantify LS and GB disease severity. Plants on plots were scored using 9 digit scale. Affected leaves and glumes samples were collected and analyzed using binocular and inverted microscope. The pycnidiospores were measured and identified to the species. The isolation frequency and diseases levels were quantified for each pathogen. Investigation showed Z. tritici predominance on wheat – 89%, while P. nodorum was the most frequently isolated from triticale – 62%. Incidence of P. avenae accounted for 1% of isolations on wheat and 4% on triticale. Varieties of wheat and triticale showing considerable levels of resistance to P. nodourm and Z. tritici were determined.