Journal of Plant Diseases and Protection (2021) 128, 749-767

Felix Hoheneder, Katharina Hofer, Jennifer Groth, Markus Herz, Michael Heß and Ralph Hückelhoven (2021)
Ramularia leaf spot disease of barley is highly host genotype-dependent and suppressed by continuous drought stress in the field
Journal of Plant Diseases and Protection 128 (3), 749-767
Abstract: Since the 1980s, Ramularia leaf spot (RLS) is an emerging barley disease worldwide. The control of RLS is increasingly aggravated by a recent decline in fungicide efficacy and a lack of RLS-resistant cultivars. Furthermore, climate change increases drought periods in Europe, enhances variable weather conditions, and thus will have an impact on severity of plant diseases. Hence, identification of RLS-resistant cultivars and understanding of disease progression under abiotic stress are important aims in integrated disease management under climate change. In the present study, we evaluated quantitative RLS resistance of 15 spring barley genotypes under drought, controlled irrigation and field conditions between 2016 and 2019 and monitored microclimatic conditions within the canopy. We identified genotypes that show robust quantitative resistance to RLS in different field environments. Our findings suggest that long-lasting drought periods create unfavourable conditions for the disease and supports that the extent and duration of leaf wetness is a key factor for RLS epidemics.
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Database assignments for author(s): Michael Heß, Ralph Hückelhoven

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ramularia collo-cygni	Barley (Hordeum vulgare)	Germany