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Beziehungen Zwischen Wirt Und Parasit Im Infektionsverlauf Von Heterudera Schachtii Schmidt in Kurzfristigen Topfversuchen

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The invasion of beet eelworm larvae into the main and lateral rootlets of host plants was studied. The distribution of larvae depends on the length of root in proportion to its volume. The peak of larval density in the whole root system is determined by reinforced invasion of the lateral roots. After the peak, new invasions succeed only in the lateral roots. Comparison of larval density in main and lateral rootlets of each host plant shows certain similarities in the maximum level of larval density. For each host plant there is a population density which normally is not exceeded. Factors regulating larval density in the roots are discussed. In the main roots, less larvae are able to reach stage III than in the lateral roots. The occurrence of one or more critical phases in the development of the beet eelworm are presumed. The sex ratio on the twenty first day appeared to be influenced by the kind of host plant, usually in the direction of surplus males. The influence of larval density on sex ratio may be overshadowed by the effect of different host plants. Except in the main root of sugar beet, the orientation of the larva within the root is usually with the tail towards the root tip, and this orientation is more strongly marked in lateral roots than in main roots.

Affiliations: 1: (Zool. Institut, Halle/Saale, Deutschland

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/content/journals/10.1163/187529257x00239
1957-01-01
2016-12-09

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