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| Registros recuperados: 13 | |
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| Pinnschmidt, Dr. Hans O.; Nielsen, Bent J.; Hansen, Dr. Henrik J.. |
| Seed born net blotch is a threat to the organic barley seed production in Denmark because it often exceeds the legal 15% infestation threshold in organically produced barley seed lots. Relationships among initial seed infestation levels, disease development during the growing season, yield parameters and net blotch infestation of the harvested grains were examined. Highly significant positive correlations among initial seed infestation, primary infection of seedlings and disease severity during the growing season as well as among disease severity at flowering and infestation of the harvested grains were found. The seed infestation level was much less than proportionally related to the primary infection of seedlings and to the disease severity later in the... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/3904/1/3904.pdf |
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| Nielsen, Bent J.. |
| Projektet har dokumenteret, at de fleste grænseværdier generelt også kan anvendes i det økologiske system. Der er dog to vigtige områder, hvor projektet forslår revidering. Det anbefales således at fastholde den vejledende tærskel for frø med ærtesyge på 5% i ærter til modenhed og 10% i ærter til helsæd, men at grænsen udvides til 20%, hvis der bliver mangel på udsæd. Der skal ved mangel på udsæd tages hensyn til, om sorten er anvendelig til helsæd eller ikke. I byg anbefales, at grænseværdierne for bygbladplet baseres på sortens resistensniveau over for sygdommen. Hvis sorten er fuldt modtagelig foreslås en grænseværdi på 5%, mens der i moderat resistente sorter kan accepteres 15% bygbladplet og i resistente sorter helt op til 25% bygbladplet. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/8050/1/8050.doc |
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| Pinnschmidt, Hans O.; Nielsen, Bent J.. |
| Results of six years of screening trials clearly indicate that effective resistance against barley leaf stripe is available, also in modern cultivars. Among the spring barley cultivars that are currently most widely grown in Denmark, Cabaret, Troon, Sebastian, Justina and Brazil appear most resistant, but only Brazil combines a favourable resistance performance (= low mean and standard deviation of environment-adjusted leaf stripe incidence) with a high number of observations (= years of testing). However, the cultivars appearing most resistant over the years are relatively old ones such as Vada, Alabama, Odin and particularly Scarlett, which has been resistant in all years in which it was tested. Amongst the new cultivars, Marigold, Native and SW Immer... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation. |
| Ano: 2006 |
URL: http://orgprints.org/10242/1/10242.pdf |
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| Nielsen, Bent J.. |
| Seed borne diseases can cause serious problems in organic seed production where there is no control methods implemented in practice. Current practice in organic agriculture is to analyse the seed and to discard the seed lot if the infection by diseases exceeds the threshold levels. There is no tolerance list specific for organic agriculture. In Denmark we use the same threshold values as recommended in conventional agriculture for seed treatment. |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general. |
| Ano: 2004 |
URL: http://orgprints.org/3902/1/3902.PDF |
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| Pinnschmidt, Hans O.; Nielsen, Bent J.; Hansen, Henrik J.. |
| Net blotch-infested seeds can be as important as initial inoculum source for net blotch epidemics as other inoculum sources such as infected straw. Our results underline the importance of varietal resistance for seed health. Employing resistant varieties results in low net blotch severity levels in the field which in turn reduces the risk of seed infestation. The results give reason to assume that the present threshold recommendations for seed born barley net blotch could be raised for normal growing conditions and/or for varieties having a reasonable level of net blotch resistance. Supplemental results are expected from ongoing field trials and more detailed analyses will follow to improve our understanding of quantitative relationships among... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/3233/1/3233.pdf |
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| Pinnschmidt, Hans O.; Nielsen, Bent J.; Hansen, Henrik J.. |
| Seed born net blotch is a threat to the organic barley seed production in Denmark because it often exceeds the legal 15% infestation threshold in organically produced barley seed lots. Relationships among initial seed infestation levels, disease development during the growing season, yield parameters and net blotch infestation of the harvested grains were examined. Highly significant positive correlations among initial seed infestation, primary infection of seedlings and disease severity during the growing season as well as among disease severity at flowering and infestation of the harvested grains were found. The seed infestation level was much less than proportionally related to the primary infection of seedlings and to the disease severity later in the... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2004 |
URL: http://orgprints.org/3261/1/F%C3%98JOenyt.pdf |
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| Pinnschmidt, Hans O.; Nielsen, Bent J.; Hansen, Henrik J.. |
| Spot blotch of barley (Bipolaris sorokiniana, perfect state: Cochliobolus sativus) occurs wherever barley is grown but is normally not considered a major problem in Danish barley production. It is therefore not included in routine disease surveys or official variety testing in Denmark. However, recommended seed contamination thresholds are 30% for spring barley and 15% for winter barley. Several spring barley varieties were grown under organic (no seed dressing, mechanical weeding) and conventional (seed dressing with fungicides, herbicide application) production conditions at three sites in Denmark in 2003. The harvested seeds were analysed for contamination levels of seed-borne B. sorokiniana using a blotter method. The percentage of seeds contaminated... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/4740/1/4740.pdf |
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| Registros recuperados: 13 | |
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