15252 1 archive 1951 disk0/00/01/52/52 2009-01-25 2009-08-20 14:42:15 2009-08-20 14:42:15 journalp show 0 de de-boel-pflanze-pflanzenschutz de-jki-nematologie-wirbeltierkunde yes 0 http://www.bundesprogramm-oekolandbau.de http://www.bundesprogramm.de/fkz=02OE107 http://www.bundesprogramm.de/fkz=02OE478 http://www.bundesprogramm.de/fkz=03OE542 http://orgprints.org/perl/search/advanced?addtitle%2Ftitle=&keywords=02OE107&projects=BOEL&_order=bypublication&_action_search=Suchen http://orgprints.org/perl/search/advanced?addtitle%2Ftitle=&keywords=02OE478&projects=BOEL&_order=bypublication&_action_search=Suchen http://orgprints.org/perl/search/advanced?addtitle%2Ftitle=&keywords=03OE542&projects=BOEL&_order=bypublication&_action_search=Suchen FALSE Hallmann Johannes Frankenberg Andrea Paffrath Andreas Schmidt Harald pub 8planthealth BÖL, BOEL, FKZ 02OE107, FKZ 02OE478, FKZ 03OE542, carrot, cereal, farmer survey, Meloidogyne, onion, Pratylenchus, Wurzelgallennematoden In an attempt to evaluate the occurrence and economic importance of plant-parasitic nematodes in organic farming in Germany, a survey was conducted with the main emphasis on vegetable and cereal production systems. For vegetables, the survey included quantification and identification of plant-parasitic nematodes in soil samples and a questionnaire for growers querying production factors and damage levels. For cereals, the survey focused on quantification and identification of plant-parasitic nematodes in soil and plant samples. Overall, Pratylenchus and Tylenchorhynchus were the most prominent nematode genera under both production systems with an incidence of over 90% of the samples. Meloidogyne was detected in 51% of the samples in both systems. Other nematode genera showed differences between the two production systems. In production systems with a high frequency of vegetables, Paratylenchus was detected in 56% of the samples and Heterodera in 15%, whereas in rotations with a high cropping frequency of cereals, incidences of plant-parasitic nematodes were 56% for Heterodera, 47% for Trichodorus and 45% for Paratylenchus. Yield losses could exceed 50% on carrots, onions and cereals and were most pronounced on sandy soils. In many cases, nematode problems started 5 to 10 years after conversion to organic farming. The survey indicated that plant-parasitic nematodes are widely spread in organic farming in Germany and can cause severe damage which may result in complete loss of the crop. 2007 published Nematology Vol. 9 6 Koninklijke Brill NV, Leiden, 2007 restricted 869-879 10029 1 15252 1 application/pdf de staffonly

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