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Einfluß von sortenspezifischen Merkmalen, unterschiedlichem Stickstoffangebot und Kupfer auf die Ertragswirksamkeit von Phytophthora infestans in Kartoffeln

Schulte Geldermann, Elmar; Dlugowski, Susanne; Finckh, Maria R. and Bruns, Christian (2005) Einfluß von sortenspezifischen Merkmalen, unterschiedlichem Stickstoffangebot und Kupfer auf die Ertragswirksamkeit von Phytophthora infestans in Kartoffeln. [The impact of varietal features, different nitrogen supply and copper treatment on the yield affecting influence of Phytophthora infestans in potatoes.] In: Heß, J and Rahmann, G (Eds.) Ende der Nische, Beiträge zur 8. Wissenschaftstagung Ökologischer Landbau, kassel university press GmbH, Kassel.

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Summary

Three potato varieties – Nicola, Rosella, and Simone, differing in the time of initiation of tuber formation (early, middle, late, respectively) – were grown in a 3-factorial field trial for two years in 2 rotational positions i. e. after grass clover and winter wheat in order to induce a different fertility status. A copper control was included. Nitrogen supply after grass clover was between 26 to 32 kg higher than after winter wheat. Late blight severity was high in 2002 but almost nil in 2003 (Area under the curve 1100 versus 75, respectively). In both years, it was consistently but not significantly higher after grass clover. N-mineralisation rates in 2002 were below average due to unfavourable weather conditions in May and June. Thus, only in 2003 the additional N-supply after grass-clover was translated into significant yield increases. Although Simone was most resistant it did not yield more then Nicola while Rosella significantly outyielded the other two varieties in both years. While copper treatment had a moderate but significant impact on disease severity in both years, yield increases due to copper were only 1 and 5% in 2002 and 2003, respectively. It is concluded that the combination of the fertility status of the site and varietal choice is an important system based means of reducing yield losses due to late blight in organic potato production while the use of copper fungicides may not result in the desired yield effects.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:Kartoffeln, Krautfäule, Stickstoffangebot, Kupfer
Subjects: Crop husbandry > Crop health, quality, protection
Research affiliation: International Conferences > 2005: Scientific Conference on Organic Agriculture
Germany > University of Kassel > Department of Ecological Plant Protection
European Union > Blight-Mop
Deposited By: Bruns, Dr. Christian
ID Code:3799
Deposited On:05 Mar 2005
Last Modified:12 Apr 2010 07:30
Document Language:German - Deutsch
Status:Published
Refereed:Peer-reviewed and accepted

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