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Hatching and Rate of Multiplication of Heterodera Rostochiensis Populations of Different Ages

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The reproduction of 1, 2, 6 and 7 year old populations of Heterodera rostochiensis, collected from natural soil, was measured in a pot experiment with four initial densities of each population. The rate of reproduction of the 2, 6 and 7 year old populations was the same at all four initial densities, but that of the 1 year old population was half that of the other populations. Therefore the number of eggs per unit weight or volume of soil is a good measure for the density and the viability of a field population irrespective of its age except perhaps for a 1 year old population.

Affiliations: 1: Institute for Phytopathological Research, Wageningen, The Netherlands


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