A5021792005- Plant Pathogens and Resistance
- Plant Disease Resistance and Genetics
- Potato Plant Research
- Agriculture, Plant Science, Crop Management
- Plant Pathogens and Fungal Diseases
- Yeasts and Rust Fungi Studies
- Wheat and Barley Genetics and Pathology
- Fungal Plant Pathogen Control
- Botany and Plant Ecology Studies
- Plant Virus Research Studies
- Organic Food and Agriculture
- Mycotoxins in Agriculture and Food
- Insect-Plant Interactions and Control
- Agricultural Economics and Policy
- Genetics and Plant Breeding
- Clinical Laboratory Practices and Quality Control
- Pesticide Exposure and Toxicity
- Agricultural safety and regulations
- Vitamin D Research Studies
- Power Systems and Technologies
- Food Supply Chain Traceability
- Soil Carbon and Nitrogen Dynamics
- Research Data Management Practices
- Education, Psychology, and Social Research
- Cooperative Studies and Economics
Aarhus University
2015-2025
Agroécologie
2003-2022
Danish Cattle Research Centre
1991-2016
Institute of Soil Science
1994
Isolates of recently spreading races yellow rust from wheat and triticale in Europe were analysed using virulence phenotypic data 2605 isolates sampled 12 countries between 2000 2014. A subset 239 was investigated by microsatellite markers. At least three non‐European origin, termed ‘Warrior’, ‘Kranich’ ‘Triticale aggressive’, identified the post‐2011 population. The Warrior race already present high frequencies first year detection most European to a large extent it replaced pre‐2011 In...
We investigated whether the recent worldwide epidemics of wheat yellow rust were driven by races few clonal lineage(s) or populations divergent races. Race phenotyping 887 genetically diverse
Phytophthora infestans, the causal agent of late blight, is a major threat to potato production in northwestern Europe. Before 1980, worldwide population P. infestans outside Mexico appeared be asexual and consist single clonal lineage A1 mating type characterized by genotype. It widely believed that new strains migrated into Europe 1976 this led subsequent changes including introduction A2 type. The characteristics recently collected isolates NW show diverse both types, sexual reproduction...
Information about disease management in winter wheat (Triticum aestiva) eight European countries was collated and analysed by scientists extension workers within the Network for Durable Exploitation of Crop Protection Strategies (ENDURE). This included information specific thresholds, decision support systems, host varieties, prevalence pathogen virulence. Major differences economic importance were observed. Septoria tritici blotch (Mycosphaerella graminicola) recognized as most yield...
Investigating the origin and dispersal pathways is instrumental to mitigate threats economic environmental consequences of invasive crop pathogens. In case Puccinia striiformis causing yellow rust on wheat, a number economically important invasions have been reported, e.g., spreading two aggressive high temperature adapted strains three continents since 2000. The combination sequence-characterized amplified region (SCAR) markers, which were developed from specific AFLP fragments,...
The objective of this study was to investigate the re-emergence a previously important crop pathogen in Europe, Puccinia graminis f.sp. tritici, causing wheat stem rust. has been insignificant Europe for more than 60 years, but since 2016 it caused epidemics on both durum and bread local areas southern additional outbreaks Central- West Europe. prevalence three distinct genotypes/races many areas, Clade III-B (TTRTF), IV-B (TKTTF) IV-F (TKKTF), suggested clonal reproduction evolution by...
Abstract Mandipropamid is an active ingredient in the carboxylic acid amide group of fungicides and plays a key role current potato late blight ( Phytophthora infestans ) management programmes. However, reports from Danish growers 2022 suggested that mandipropamid had lost its efficacy. A study was therefore conducted to investigate sensitivity isolates collected fields which been reported be ineffective. Seventy‐two P . Denmark were genotyped using microsatellite markers, revealing...
<title>Abstract</title> Late blight (<italic>Phytophthora infestans</italic>) is a major disease in potato cultivation, managed primarily with synthetic fungicides. This reliance makes potatoes one of the crops highest fungicide load. To reduce chemical dependence and promote Integrated Pest Management (IPM), alternative solutions are needed. study explores biological control agents (BCAs) plant resistance inducers (PRIs) as sustainable alternatives. We screened 17 BCAs 3 PRIs detached leaf...
A total of 743 single‐lesion isolates Phytophthora infestans were collected in summer 2003 from Denmark, Finland, Norway and Sweden. Most the tested for mating type, subsets sensitivity to fungicides virulence (host specific pathogenicity). Approximately 60% A1 type each country. Both types present 40% fields where more than one isolate was tested, indicating strong potential sexual reproduction. The proportion metalaxyl‐resistant dropped under 15% observed early 1990s possibly due lower...
A simple forecasting model for Septoria spp. in winter wheat was developed based on historical data (1980–89) including precipitation, growth stage, disease severity and yield response to fungicide treatments. The number of days with precipitation ≥ 1 mm, calculated during a 30‐day period starting at the beginning stem elongation (GS 32), correlated well attacks later season trials Seven or 8 rainfall mm suggested as threshold treatment. Model development possible further improvements are discussed.
Until recently, genotypes of Phytophthora infestans were regionally distributed in Europe, with populations western Europe being dominated by clonal lineages and those northern genetically diverse because frequent sexual reproduction. However, since 2013 a new lineage (EU_41_A2) has successfully established itself expanded the sexually recombining P. Europe. The objective this study was to phenotypic traits infestans, which may explain its successful establishment expansion within...
During the period 2000–03, local potato cultivars in Estonia, Latvia, Lithuania, Poland and Denmark were tested for foliar resistance to Phytophthora infestans (late blight) an international field trial network. Four standard included trials: Sava, Oleva, Danva Kuras. Primary disease‐assessment data entered into a common database, parameters from disease progress curves calculated made available on interactive web pages. A regression model, using relative area under curve (RAUDPC) values cv....
Abstract Since the mid‐2010s, Phytophthora infestans clones that have been dominant in Western Europe from beginning of 21st century, for example, EU_13_A2, EU_6_A1 and EU_1_A1, are being replaced by several other emerging clones, including EU_37_A2. The objective this study was to determine whether main drivers success EU_37_A2 associated with decreased fungicide sensitivity, increased virulence and/or aggressiveness. Axenic P . cultures were sampled 2016 2017 growing seasons potato crops...
Potato crop losses can be substantial when conditions for late blight ( Phytophthora infestans ) development and spread are favourable. In this study, drivers of differences between the P. population structures in Latvia Lithuania, two neighbouring countries with similar potato‐growing traditions, were investigated. Genotypes genetic diversity analysed using a 12‐plex simple sequence repeat SSR marker assay. High was demonstrated both populations, being higher Latvia. It would appear that...
Potato fields in Denmark, Finland, Norway and Sweden were sampled for single‐lesion isolates of Phytophthora infestans . The aggressiveness the was determined on detached leaflets potato cvs Bintje (susceptible) Matilda (moderately resistant). tests carried out respective home countries isolates, with exception Danish isolates. Fifteen studied each other three countries, including five tested all laboratories. Results obtained from revealed substantial differences between test laboratories...
Understanding the level and type of resistance in potato varieties is relevant for integrating varietal into management late blight. Accordingly, 54 were tested their to blight 2019 2020 Denmark. Spreader rows artificially inoculated ensure an even inoculum distribution trial. Disease severity was assessed once or twice per week. Cluster analysis (CA) done based on weighted mean absolute rate (WMAR), relative area under disease progress curve, onset (Xo), middle season, time reach 1%...