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Effects of different plant protection treatments regulating late blight (Phytophthora infestans) in organic potato production

Böhm, Herwart and Cerny, Dirk (2002) Effects of different plant protection treatments regulating late blight (Phytophthora infestans) in organic potato production. In: Wenzel, Gerhard and Wulfert, Ingrid (Eds.) Vorträge für Pflanzenzüchtung: Abstracts of Papers and Posters, Supplement I, European Association for Potato Research (EAPR), p. 208.

[thumbnail of 675-boehm-cerny-2002-phytophthora-infestans.pdf] PDF - English


The effects of different plant protection treatments on foliar infestation by Phytophthora infestans and on tuber yield were tested in field trials from 1999 to 2001 under organic farming conditions. Foliar treatments with plant extracts of Potentilla erecta, Salvia officinalis, seaweed extracts, potassium oleate, some other plant vigorisers and combinations with an adjuvant as well as copper hydroxide resulted in different Area Under Crop Health Curves and tuber yield increase. Experiments were conducted at an ecologically-managed farm in the North of Germany (near Hamburg) on a sandy soil or loamy sand (pH 5.2 – 5.7) with the possibility of sprinkler irrigation. In all field trials copper hydroxide showed the lowest AUCHC and the highest yield (+17.7-25.9 %) compared to the control. According to the application of plant extracts there was no significant effect on late blight infestation of leaves and the yield increase of up to 15 % was not significant. Also the seaweed extracts and the other plant vigorisers showed no significant effect on the AUCHC and the tuber yield. At the moment there is no effective alternative for the use of copper to reduce late blight infestation in organic potato production.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:potato, late blight, plant protection, Phytophthora infestans, yield
Subjects: Crop husbandry > Production systems > Root crops
Crop husbandry > Crop health, quality, protection
Research affiliation: Germany > Universität Kiel > Department of Crop Production and Plant Breeding > Grassland and Forage Production/Organic Farming
Related Links:http://www.eppo.org/PUBLICATIONS/EPPONews/conf.html, http://www.grassland-organicfarming.uni-kiel.de/home_de.html, http://www.oel.fal.de/index.htm?page=/fachgebiete/default.htm
Deposited By: Böhm, Dr. Herwart
ID Code:675
Deposited On:05 Jun 2003
Last Modified:12 Apr 2010 07:27
Document Language:English
Refereed:Not peer-reviewed
Additional Publishing Information:Poster 14

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