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Susceptibility to barley leaf stripe (Pyrenophora graminea) in spring barley of the German varieties list under natural infection conditions in organic farming
Project
Project code: 03OE022
Contract period: 15.03.2004
- 31.10.2006
Budget: 38,820 Euro
Purpose of research: Applied research
From the official recommended varieties list of 2003 fourty-five spring barley beside five samples with proved resistance and five varieties from Denmark and Austria each were exposed to a natural attack with barley leaf stripe between plots with infected seeds during two test cycles. Varieties Peggy and Baccara with less than 0.1% infestation and accessions Vada, Betzes, Ricardo and Trysil showed strongest resistance. Another ten varieties remained below 1% infestation. Thirteen varieties with more than 5% infestation reached a yield endangering level of susceptibility. With variety Prestige an attack up to 38% was noticed. Beneath variety specific susceptibility the local conditions for infection into flowers showed highest influence to absolute degree of infestation in the following generations. For seed production under organic farming in particular at locations with high risk for stripe disease and if multiplication shall be done for several generations organically, resistant varieties are obligatory. For testing suitability of the field trial design for natural spreading of the disease, seeds of a susceptible variety were grown on several plots. These plots were divided into twelve drilling rows each and implemented in the variety test like the varieties between infected barley LINZ 358150 cultivated in stripes during two test cycles at Darzau. From each drilling row of each plot of the spore catching variety a bunch of ears was harvested manually and always grown in the second year of a cycle on small plots of 2m² to test the differences per previous year drilling rows with regard to infection of flowers. For a satisfying assessment of susceptibility a mixed sample from at least six drilling rows side by side like in the variety trial was necessary. Starting with uninfected seed two successive test cycles were necessary to recognise clear a very high susceptibility under natural infestation.
Section overview
Subjects
- Crop Production
- Organic Farming
Framework programme
Federal Organic Farming Scheme and other forms of sustainable agriculture (BÖLN)
