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Die Räumliche Verteilung Des Primärbefalls Von Heterodera Schachtii Schmidt in Den Wirtswurzeln

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Roots of rape (Brassica napus L. var. arvensis (Lam.) Thell.) and sugar beet (Beta vulguris L. f. altissima D.C.) grown in pots inoculated with beet eelworm (Heterodera schachtit Schm.), were examined after 7, 14, 21 and 28 days to determine the spatial distribution of invading larvae, the root tips, points of origin of lateral roots and the intervening regions being considered separately. The total numbers of larvae present indicated no preference for any one of these regions. Reference to the numbers in lengths of roots from individual regions, however, shows a clear preference for the points of origin of the lateral roots at all the times of examination. In contrast to results from experiments in agar, the root tips show only a relatively small degree of infestation. This is probably due to the different conditions for infection in soil and in agar. The tendency of the larvae to lie together in compact groups was also studied. The greatest aggregations exist at the points of origin of lateral roots and are coupled with greater infection densities. After 14, 21 and 28 days newly invaded second-stage larvae are found almost entirely in the terminal regions of the lateral roots and also in the points of origin of lateral roots. Previously unattacked parts of roots are clearly preferred. Males are more numerous in the aggregations. The observed pattern of invasion is in accordance with the hypothesis of root attraction and also with that of random movement but favours the former.

Affiliations: 1: Zoologisches Institut, Greifswald, Deutschland


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