8843: Lösungsansätze für Nachbauprobleme durch bodenbürtige Pathogene im biologischen Erdbeeranbau [Possible solutions for replant problems caused by soil-borne pathogens in organic strawberry production]

Spornberger, A.; Steffek, R.; Stich, K.; Jetzik, K.; Scheiblauer, J.; Altenburger, J.; Halbwirth, H. and Gosch, C. (2006) Lösungsansätze für Nachbauprobleme durch bodenbürtige Pathogene im biologischen Erdbeeranbau [Possible solutions for replant problems caused by soil-borne pathogens in organic strawberry production]. Paper presented at ecofruit - 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing, Weinsberg/Germany, 31.1.-2.2.2006; Published in Boos, Markus, Eds. ecofruit - 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 31st January to 2nd February 2006 at Weinsberg/Germany, page pp. 138-144. Fördergemeinschaft Ökologischer Obstbau e.V. (FÖKO), Traubenplatz 5, D-74189 Weinsberg.

Summary

Soil-borne pathogens, above all Verticillium sp. cause plant losses and yield decreases in many Austrian strawberry fields, also in organic farming systems; in a research project possibilities to resolve this problem were examined. In a field trial, which was started 1998, organically managed and differently fertilized plots (green compost, manure, hornchips) were compared to an unfertilised control plot and to two mineral fertilized and conventionally treated plots; the differences in field characteristics of strawberries in 2004 and 2005 were low, but differences in storage and biochemical characteristics could be seen in 2005. Some new cultivars tested as alternative to the very sensitive 'Elsanta' planted in 2005 on several farms showed a higher tolerance to diseases and good yield and fruit quality characteristics. Brassica sp. planted as an intercrop before strawberries reduced the amount of microsclerotia of Verticillium dahliae in highly infested soils, nevertheless the system has to be optimised and adapted to our climatic and husbandry conditions in further trials.

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