Person: Heß, Michael
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Veröffentlichung Neue Bedeutung der Sorten zur Kontrolle der Ramularia-Blattflecken in der Gerste(2020) Heß, MichaelVeröffentlichung UBA: Keine unzumutbare Einschränkung(2020) Heß, MichaelVeröffentlichung Alternative Maßnahmen gegen Ramularia(2020) Heß, MichaelVeröffentlichung Ramularia leaf spot disease of barley is highly host genotype-dependent and suppressed by continuous drought stress in the field(2020) Hoheneder, Felix; Hofer, Katharina; Heß, Michael; Groth, JenniferSince 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. © The Author(s) 2020Veröffentlichung Ramularia leaf spot disease of barley is highly host genotype-dependent and suppressed by continuous drought stress in the field(2021) Hoheneder, Felix; Hofer, Katharina; Heß, Michael; Groth, JenniferSince 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. © The Author(s) 2021Veröffentlichung Crashkurs Personalentwicklung(Haufe Group, 2020) Grund, Sven; Heß, Michael; Weiss, Wolfgang- Personalentwicklung planen und umsetzen - Schritt-für-Schritt-Anleitungen und zahlreiche Praxisbeispiele - Mit vielen Arbeitshilfen online Gute Maßnahmen zur Personalentwicklung erweitern Wissen und Kompetenzen von Mitarbeitern und binden Leistungsträger langfristig an das Unternehmen. Doch was ist Personalentwicklung überhaupt und welche Rolle nimmt man als "PE-Vertreter" im eigenen Unternehmen ein? Dieser Crashkurs beschreibt Inhalte und Methoden, Herangehensweisen und Instrumente und beantwortet alle wesentlichen Fragen. Sie erhalten ein Prozessmodell, das praxisnah und Schritt für Schritt alle entsprechenden Maßnahmen unterstützt. Neu in der 2. Auflage: Neue, aktualisierte und weiterentwickelte Werkzeuge und Methoden, besonders im Bereich evidenzbasierte Personalentwicklung und Organisationsentwicklung Quelle: VerlagsinformationVeröffentlichung Spore dispersal patterns of the ascomycete fungus Ramularia collo-cygni and their influence on disease epidemics(2023) Havis, N. D.; Kaczmarek, J.; Jedryczka, M.; Heß, Michael; Fang, ZhaolunRamularia leaf spot is a major economic disease of barley caused by the dothidiomycete fungus Ramularia collo-cygni. The fungus has a complex life cycle which includes extensive late season spore release events and a seed-borne phase. Predicting disease epidemics during the growing season remains a difficult challenge. To better understand the interaction between spore movement and disease epidemics, spore samplers were set up in Germany (two sites over 4 years), Poland (seven sites over 2 years) and the UK (two sites over 9 years), where the disease has been observed. Spore concentrations were determined using a real time PCR assay, and meteorological data were obtained from co-located automatic stations. Spore release events were seen to peak in June on mainland Europe and July in the UK. The pattern of spore release was broadly similar across countries with earlier peaks in mainland Europe. A relationship was observed in the UK between July spore levels and disease in following winter barley crops. Rainfall and temperature were proposed as significant drivers of spore release in these months. The major environmental parameter associated with spore release across the two UK sites was crop surface wetness, although some site-specific interactions were noted for rainfall and wind movement. Regression analysis of spore patterns and disease epidemics indicates a relationship between spore levels 75â€Ì105 days pre harvest and final disease levels in UK winter barley crops. This relationship was not observed in spring barley. The implications on risk forecasts are discussed.Veröffentlichung Host genotype and weather effects on fusarium head blight severity and mycotoxin load in spring barley(2022) Hoheneder, Felix; Biehl, Eva Maria; Heß, Michael; Hofer, KatharinaEpidemiology of Fusarium Head Blight (FHB) of spring barley is relatively little understood. In a five-year study, we assessed quantitative resistance to FHB in an assortment of 17 spring barley genotypes in the field in southern Germany. To this end, we used soil and spray inoculation of plants with F. culmorum and F. avenaceum. This increased disease pressure and provoked genotypic differentiation. To normalize effects of variable weather conditions across consecutive seasons, we used a disease ranking of the genotypes based on quantification of fungal DNA contents and multiple Fusarium toxins in harvested grain. Together, this allowed for assessment of stable quantitative FHB resistance of barley in several genotypes. Fungal DNA contents were positively associated with species-specific Fusarium toxins in single years and over several years in plots with soil inoculation. In those plots, plant height limited FHB; however, this was not observed after spray inoculation. A multiple linear regression model of recorded weather parameter and fungal DNA contents over five years identified time periods during the reproductive phase of barley, in which weather strongly influenced fungal colonization measured in mature barley grain. Environmental conditions before heading and late after anthesis showed strongest associations with F. culmorum DNA in all genotypes, whereas for F. avenaceum, this was less consistent where we observed weather-dependent associations, depending on the genotype. Based on this study, we discuss aspects of practical resistance breeding in barley relevant to improve quantitative resistance to FHB and associated mycotoxin contaminations. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.