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| Registros recuperados: 11 | |
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| Pinnschmidt, H.O.; Hovmøller, M.S.; Østergård, H.. |
| The resistance of spring barley varieties to powdery mildew, leaf rust, leaf scald and net blotch was characterized by using results from inoculated small-plot nurseries and larger survey plots subject to natural infection. The experiments were conducted in different environments. Both trial types often yielded complementary results with respect to the ranking of varieties suggesting that a recommended variety characterization should include both naturally infected survey-type trials and nursery trials in which the most relevant pathogen isolates and/or isolate mixtures or populations are used for inoculation. Average and median values of the diseased leaf area of a variety were highly correlated with each other and with the genotype main effect determined... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation. |
| Ano: 2006 |
URL: http://orgprints.org/8203/1/8203.pdf |
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| Pinnschmidt, H.O.; Justesen, A.F.. |
| Fusarium culmorum and Microdochium nivale are considered important seed-borne diseases of wheat in Denmark. Their damage effects consist in reducing seed germination and plant emergence which leads to reduced plant density, panicle numbers/area and yield. The aim of this study is to find out whether and to what degree these damage effects can be compensated by increased seeding rates. A trial was therefore conducted in 2004 in which seed lots of three winter wheat varities (Ritmo, Bill and Boston) having various degrees of infection by F. culmorum and Microdochium nivale were sown at various seeding rates. Seed contamination of the two pathogens was determined by counting the number of discoloured roots in the seed batches (Doyer method). Plant emergence... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/7933/1/7933.pdf |
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| Pinnschmidt, H.O.. |
| En markforsøg i 2003 havde vist at fremspiring af Fusarium- eller Microdochium-inficeret vinterhvede blever mindre jo senere såtidspunktet. Markforsøg blev gennemført med 3 sorter (Bill, Boston, Ritmo) i 2004 og Ritmo i 2005 med udsædspartier smittet med F. culmorum og M. nivale. I 2004: 4 smitteniveauer, 3 udsædsmængder; i 2005: 3 smitteniveauer, 9 udsædsmængder; 3 blocs i begge forsøg og sådato 1. October. Det viste sig at den gns. antal planter/frø var højt positiv korreleret med spireevne (fraktion spirende kerne = % spirende kerne/100) såvel som med sundhedsstatusen af frøpartierne spireevne (fraktion sunde kerne = [100 - % smittede kerne]/100). Fraktion spirende kerne og fraktion sunde kerne var også højt positivt korreleret med hinanden. Desuden... |
| Tipo: Working paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/7937/1/7937.doc |
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| Østergård, H.; Kristensen, K.; Pinnschmidt, H.O.; Hansen, P.K.; Hovmøller, M.S.. |
| Abstract For low-input crop production, well-characterised varieties increase the possibilities of managing diseases and weeds. This analysis aims at developing a framework for analyzing grain yield using external varietal information about disease resistance, weed competitiveness and yield potential and quantifying the impact of susceptibility grouping and straw length scores (as a measure for weed competitiveness) for predicting spring barley grain yield under variable biotic stress levels. The study comprised 52 spring barley varieties and 17 environments, i.e., combinations of location, growing system and year. Individual varieties and their interactions with environments were analysed by factorial regression of grain yield on external variety... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Weed management Breeding; Genetics and propagation. |
| Ano: 2008 |
URL: http://orgprints.org/14957/1/14957.pdf |
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| Pinnschmidt, H.O.; Nielsen, B.J.; Hansen, H.J.. |
| Seed-borne net blotch is a threat to organic barley seed production in Denmark because it often exceeds the recommended 15% contamination threshold in barley seed lots. This threatens the supply of organic barley growers with organically produced healthy barley seeds. The ORGSEED project aims at quantifying the links between initial seed contamination, primary seedling infection, disease severity during the growing season, yield parameters and new contamination of the harvested grains to improve decision support for handling net blotch contaminations in organic barley- and barley seed production. The harvested grains of spring barley varieties grown at several sites in Denmark in 2002 and 2003 were used as seed lots in subsequent trials in 2003 and 2004.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/7932/1/7932.pdf |
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| Vollmer, J.H.; Pinnschmidt, H.O.; Munk, L.; Østergård, H.. |
| Background and objectives Two pathogens growing on the same leaf compete for the same resources, i.e. space and plant nutrients. This may lead to density dependent disease development. The pathogens may also influence each other directly such that the influence of one on the other is more complex than a simple function of the area of the other pathogen. Different interaction types are, for example, competition, mutualism and exploitation. The importance of such interactions for epidemics of simultaneously occurring pathogens has received little attention. The objective of this study is to investigate the simultaneous epidemic development of Rhynchosporium secalis (causing scald) and Drechslera teres (causing net blotch) on spring barley under field... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions Breeding; Genetics and propagation. |
| Ano: 2005 |
URL: http://orgprints.org/5974/1/5974.pdf |
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| Pinnschmidt, H.O.. |
| I partier med kraftige udsædsbårne smitte af bygbladplet var der udbredte primære angreb på de første blade og en efterfølgende kraftig opformering af bladplet i bygafgrøden. Der kunne konstateres en tydelig korrelation mellem udsædsbåren smitte og de første primære angreb såvel som efterfølgende angreb. Denne korrelation var afhængig af sorten. Det anbefales, at grænseværdien for bygbladplet baseres på sortens resistensniveau over for sygdommen. Hvis sorten er fuldt modtagelig for bygbladplet forslås en grænseværdi på 5%, mens der i moderat resistente sorter kan accepteres 15% bygbladplet og i resistente sorter helt op til 25% bygbladplet. Angreb af Fusarium på kernerne var korreleret med spireevne af kernerne og fremspiring i marken. Kvantificering... |
| Tipo: Working paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/8015/1/8015.pdf |
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| Pinnschmidt, H.O.. |
| Overskridelse af den nuværende tærskel af 15% frøsmitte vil formodentlig kun i modtagelige sorter som Lux og Prestige give anledning til høje bladpletepidemier og dermed højt risiko for høje udbyttetab. Mit forslag er derfor: tærsklerne sættes ned (5%) for sorter i PVO gruppe 3, tærsklerne bliver som de er (15%) for sorter i PVO gruppe 2, tærsklerne sættes op for sorterne i PVO gruppe 1 (25%); tærsklerne er ikke nødvendige for sorter i PVO gruppe 0. (Faktisk vil man i praksis sandsynligvis ikke kunne finde 25% frøsmitte i sorter i PVO gruppe 0 og/eller 1.) |
| Tipo: Working paper |
Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions. |
| Ano: 2006 |
URL: http://orgprints.org/7935/1/7935_paper.doc |
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| Pinnschmidt, H.O.. |
| ORGSEED undersøgelserne viser, at der findes en række vårbygsorter med lovende resistens overfor stribesyge og nøgenbrand. Under dyrkningsforhold, hvor de to sygdomme betragtes som nøgle-problemer, burde sortsvalget derfor tager hensyn til de resistensoplysninger, som ORGSEED projektet har tilvejebragt. Men det skal huskes, at muligheden for at bruge sortsresistens ikke kommer af sig selv. Det kræver stadig årvågenhed med hensyn til at følge skift i sorternes sygdomsreaktion over tid og dette kræver fortløbende resistens-screening og –afprøvning af markedsførte sorter såvel som af forædlingsmaterialet. |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation. |
| Ano: 2005 |
URL: http://orgprints.org/8041/1/8041.PDF |
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| Registros recuperados: 11 | |
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