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| Registros recuperados: 97 | |
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| Borgen, Anders; Backes, Gunter; Müller, Karl-Josef; Spieß, Hartmut. |
| When assesssing races of common bunt for virulens pattern within a region, it is important to take into account that collected spores may represent a diverse population of different virulence races. When screening spores on a differential set of wheat lines with known resistance genes, a low infection rate on a resistant wheat variety does not necessarily demonstrate that virulence is absent in the spore collection, but could be a sign that virulence is present, but only present in a low frequency among the spores. If just a few spores within a spore sample are indeed virulent, they may infect some plants and from there multiply the virulence quite rapidly next years. Previous studies have shown that virulence against most resistance genes were present in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Breeding; Genetics and propagation. |
| Ano: 2018 |
URL: http://orgprints.org/34171/1/borgen-etal-2018-XX_Bunt_Proceedings.pdf |
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| Nielsen, B.J.; Borgen, Anders; Scheel, Christiane; Nielsen, G.C.. |
| Effektiv og systematisk bejdsning af størstedelen af den danske såsæd har medført, at alvorlige og tabsgivende frøbårne sygdomme har været holdt på et meget lavt niveau. En stor del af sædekornet (85-90%) bejdses i dag, mens bejdsning af andre afgrøder varierer en del afhængig af den aktuelle forekomst af sygdomme. Det samlede forbrug af bejdsemidler (fungicider og insekticider ) ligger i størrelsesordenen 80-110 t virksomt stof ( i 1994 11-12 % af det samlede fungicid og insekticidforbrug eller omkring 3 % af det samlede pesticidforbrug). Sygdommene er, trods denne systematiske indsats, ikke udryddet, men kun holdt på et lavt niveau. I en fremtidig dyrkningspraksis uden effektiv bekæmpelse af frøbårne sygdomme, ville en række alvorlige sygdomme relativt... |
| Tipo: Report |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 1998 |
URL: http://orgprints.org/34207/3/aukenrap_34207.pdf |
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| Borgen, Anders. |
| Spores of common bunt (Tilletia caries) was sampled from different places in Denmark in 2000-2005 and maintained as a bulk sample on susceptible varieties. In 2011 and 2012, spores were harvested from selected infected varieties, and used to reinoculate the same variety from where they were harvested. 98 out of 240 tested varietes had an increase of infection from this inoculation method compared with infection from the bulk spore sample. This is interpreted as a sign of virulence development. Using this method on the differential varieties for bunt resistance and other varieties with known bunt resistance genes indicated that virulence races were present able to infect varieties having resistance genes Bt-1, Bt-2, Bt-3, Bt-4 Bt-5, Bt-7, Bt-8, Bt-10 and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Breeding; Genetics and propagation Crop health; Quality; Protection Research methodology and philosophy. |
| Ano: 2014 |
URL: http://orgprints.org/26891/7/26891.pdf |
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| Borgen, Anders. |
| Introduction The key control measure of plant diseases in organic agriculture is crop rotation, mixed cropping and moderate fertilization. A wide range of plant diseases can be controlled or minimized in this way. However, at least one group of plant diseases, the seed borne diseases, cannot. The seed borne diseases are not transmitted through the soil, and crop rotation is therefore an insufficient tool. Mixed cropping is impractical in seed propagation, where seed purity according to the seed legislation is imperative. The fertilization level primarily has an impact on facultative saprophytes, and not on the specialized seed pathogens. Seed borne diseases were the first plant pathogens to be controlled by pesticides. Heavy metals has been used as... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/3194/1/IFOAM_FAO_2004.pdf |
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| Borgen, Anders. |
| Forskning er en modsætning til økologernes intuitive erkendelsesproces. Og det gælder både videnskab, der forsøger at atomisere verden i forklaringsprocessen, hvor sammenhænge og placering reduceres væk til fordel for detaljeret beskrivelse af delemnerne, og i systemanalysen, hvor fokus er på sammenhænge, men hvor delene reduceres væk. Forskningen har sin styrke ved at kunne teste hypoteser, men har sin svaghed ved at have problemer med at skabe relevante hypoteser og ved at gøre testresultaterne anvendelige (generaliserbare). Intuitionen derimod er holistisk i den forstand, at den forsøger at inddrage alt, og den er god til at skabe hypoteser og vurdere resultater, men har sin svaghed ved ikke at kunne dokumentere dem. En økologisk forskningsproces må... |
| Tipo: Journal paper |
Palavras-chave: Research methodology and philosophy. |
| Ano: 1998 |
URL: http://orgprints.org/34208/3/forum1998_34208.pdf |
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| Borgen, Anders. |
| Common bunt caused by the fungus Tilletia tritici (syn. T.caries) is one of the most devastating plant diseases in wheat. In conventional agriculture the disease is controlled exclusively by fungicide seed treatment, but in organic farming these fungicides are not accepted. Previous studies in India have shown that seed treatment with plant extracts of Canabis sativa, Eucalyptus globulus, Thuja sinensis and Datura stramonium was fully effective against the disease under field conditions. Later, in vitro studies have shown that also germination of spores of the Karnal bunt pathogen (Neovossia indica) could be prevented by these plant extracts. The experiment was repeated in Denmark with extracts from the same species grown in Denmark, which has climate... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/4909/1/4909.pdf |
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| Borgen, Anders. |
| Ethvert husdyr og enhver kulturplante tager et lille bitte skridt i retning af yderligere domesticering hver gang, den får unger eller sætter frø. Opfører en hund sig som en ulv, bliver den aflivet, men jo mere den opfører sig som en god hund, jo større er dens chancer for at leve længe og få mange hvalpe. På denne måde sker der hele tiden en udvikling af tamhunden som art, og for hver generation bevæger den sig stille og roligt væk fra at være ulv. Denne proces er foregået i omkring siden jægerstenalderen for 40.000 år, længere end noget andet dyr. Derfor er hunden med tiden blevet menneskets bedste ven. Alle andre husdyr og kulturplanter hører agerbruget til, og de fleste kommer fra Mellemøsten, hvor domesticeringsprocessen startede for 10.000 år siden.... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Biodiversity and ecosystem services Breeding; Genetics and propagation. |
| Ano: 2014 |
URL: http://orgprints.org/26892/7/26892.pdf |
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| Borgen, Anders. |
| Common bunt caused by the fungus Tilletia tritici (syn. T.caries) is one of the most devastating plant diseases in wheat. In conventional agriculture the disease is controlled exclusively by fungicide seed treatment, but in organic farming these fungicides are not accepted. Previous studies in India have shown that seed treatment with plant extracts of Canabis sativa, Eucalyptus globulus, Thuja sinensis and Datura stramonium was fully effective against the disease under field conditions. Later, in vitro studies have shown that also germination of spores of the Karnal bunt pathogen (Neovossia indica) could be prevented by these plant extracts. The experiment was repeated in Denmark with extracts from the same species grown in Denmark, which has climate... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/4910/1/4910.pdf |
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| Borgen, Anders; Kristensen, Lars. |
| Common bunt (Tilletia tritici) infects the wheat plant during germination of the seed. For experiments with common bunt it is conventional to examine symptoms of infection in the head of the plant. Previous research has advocated the possibility of scoring chlorosis on the leaf instead of head symptoms in order to reduce the duration of the experiment. By comparing the two diagnosis methods in climate chambers, the current experiment demonstrated that the sensitivity and specificity of the two methods depends on the wheat variety used. Using leaf symptoms as a diagnosis for infection has considerable disadvantages when used for screening for resistance in breeding programs, but have advantages e.g. when investigating effects of seed treatments. |
| Tipo: Journal paper |
Palavras-chave: Breeding; Genetics and propagation. |
| Ano: 2003 |
URL: http://orgprints.org/3192/1/Macroscopic_leaf_symptoms_in_wheat_infected_by_Tilletia_tritici.htm |
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| Registros recuperados: 97 | |
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