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Relation Between Population Density of Potato Cyst Nematodes and Measured Degrees of Susceptibility (Resistance) of Resistant Potato Cultivars and Between This Density and Cyst Content in the New Generation

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For more content, see Nematology.

The degree of susceptibility (resistance) of a potato cultivar to (against) a pathotype of potato cyst nematode (Globodera rostochiensis (Woll.), G. pallida Stone) can be defined quantitatively as the ratio between the multiplication rate of this pathotype on the cultivar to be tested and that of the same number of nematodes on one or more susceptible cultivars, used as standards and grown simultaneously with the cultivar(s) to be tested. However, this ratio appeared to be density dependent in some susceptible cultivars. Also the relation between initial and final population densities (Pi and Pf) of pathotype Ro 1 on the resistant cultivars Ehud and Astarte differed considerably from that on susceptible cultivars. It could be described by the equation Pf = ya(1-qPi) (-elog q)-1, in which y = m + (1-m)zPi, a = the maximum rate of multiplication, q, z and m are constants < 1 and the appropriate value of z was much smaller than that of q. It is interpreted as expressing a density dependent reduction of the space in the roots available for the development of adult females, starting at very small values of Pi. It indicates that the degree of resistance measured is density dependent. Degrees of susceptibility against Ro 1 of cvs. Ehud and Astarte ranged from 0.18 to 1 times that at very small Pi. Cyst contents differed on different cultivars and were negatively correlated with initial egg density on susceptible ones (largest to smallest number of eggs/cyst > 2.6: 1), but on resistant cultivars were unrelated (Ro 1 on cv. Ehud) or with much smaller ratios (< 1.8 : 1) (Ro 1 on cv. Astarte, Ro 2/3 on cv. Darwina).

Affiliations: 1: Research Institute for Plant Protection, Wageningen, The Netherlands


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