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Über Das Auftreten Freilebender Wurzelnematoden in Rheinischen Böden Unter Besonderer Berücksichtigung Der Standortverhältnisse

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1. With a modified "Baermann-method" it was possible to find approximately 85 percent of the mobile free-living root-nematodes in the soil. 2. In a field test at Klein Altendorf (district of Bonn) a considerable increase was obtained in the population of Paratylenchus when growing wheat, sugar-beets and carrots three times and of Pratylenchus (mainly P. penetrans) when growing potatoes three times. Beets following potatoes caused a decrease in Pratylenchus, potatoes following beets a decrease in Paratylenchus. 3. Observations on the population at Klein Altendorf in 1958 showed, for both Pratylenchus and Paratylenchus, a minimum in June/July and a maximum between August and November. The increase after the minimum followed high soil temperatures and heavy rains. Except for Paratylenchus in the wheat plot the minima were observed in July, the month with relatively little rainfall. 4. In a sandy soil (Issum/district of Geldern) the total population of free-living root-nematodes was composed of Tylenchorhynchus and Pratylenchus and to a lesser degree of Paratylencbas, In loess-loam (Sinthern/district of Köln) and in stony, partly heavy loam (Kirchheim/district of Euskirchen) Rotylenchus were also present. Potatoes always caused a decrease in free-living root-nematodes whereas clover-grass and winter-wheat almost always caused an increase. No significant tendency could be observed in the winter-rye and sugar-beet plots.

Affiliations: 1: Institut für Pflanzenkrankheiten der Universität, Bonn, Deutschland


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