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Untersuchungen Über Paratylenchus Amblycephalus N. Sp. (Nematoda, Criconematidae) 1)

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image of Nematologica
For more content, see Nematology.

A description of Paratylenchus amblycephalus, n. sp. on apple roots is given. P. amblycephalus is characterised by a flat, blunt head; female stylet 32 μ ; males numerous, without stylets. Four free larval stages were observed, the fourth with a reduced stylet. Eggs were found 7 days after the roots were attacked and larvae emerged after 14 days. Populations increased greatly on infested apple seedlings; males were often predominant. Symptoms caused by attacks of P. amblycephalus on the roots of apple seedlings are described. Soil temperatures of 21° and 16°C favoured on attack more than 10° or 4°C. Temperatures below 0°C and high soil moisture content reduced the longevity of the nematodes, which were found to be relatively resistant to desiccation of the soil.

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


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