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Experimentelle Untersuchungen Über Die Wanderung Von Nematoden

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For more content, see Nematology.

Three groups of experiments were carried out to test the migratory behaviour of some plant parasitic nematodes. I. Host plants were grown in sterilised soil and cysts of Heterodera rostochiensis and H. schachtii added at different distances from the plants. It was shown that larvae hatched only when roots came close (about 1-2 cm) to the cysts. No hatching or attraction were observed over appreciable distances. Usually larvae moved about 20 cm only during the growing season. 2. Cysts or larvae were placed in wooden boxes filled with sterilised soil without plants. Water or root diffusate was dropped onto the soil at various distances from the site of Inoculation. Here also root diffusates had no influence on the larvae over a distance of more than 2-3 cm. However when the eelworms came in direct contact with the root diffusate they moved faster and farther. Some results suggested a definite attraction. 3. Nematodes were put on filter paper strips and into plastic channels filled with sand of 200-500 μ particle size. The strips and channels were connected by wicks dipping into solid watch glasses containing water or root diffusate, so that the sand and filter paper were kept moistened with these fluids by capillarity. Larvae of Heterodera appeared to show a rhcotaxis. Greater numbers moved with the stream of fluid. Stem eelworms showed no noticeable reaction to the direction of the current. When the media were moistened with root diffusate, the larvae of Heterodera migrated faster and farther than when moistened with water. An orientated attraction could not be observed.

Affiliations: 1: Biologische Bundesanstalt, Institut für Hackfruchtkrankheiten und Nematoden-forschung, Münster (Westf.), Deutschland


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