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The Relationships Between Population Increase and Population Density in Plant Parasitic Nematodes

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For more content, see Nematology.

III. Definition of the terms host, host status and resistence How good a host a plant is to a plant parasitic nematode is indicated by the values of the two constants a (= ert) and E (or M) in the population increase equations. For good hosts both are high, for poor hosts low. For intermediate cases both are intermediate or one is fairly high but the other fairly low. What should be called high or low values of a and E depends on the nematode species. IV. The influence of external conditions on the regulation of population density The maximum rate of multiplication and the equilibrium density of nematode populations depend on external conditions, as well as on inherent characters of the animals and the host plant. The influences of a factor on each of these are not necessarily related. A change of conditions may result in increase of one and decrease of the other or in increase or decrease of both. The equilibrium densities of Rotylenchus uniformis, Piatylenchus crenatus and Ditylenchus dipsaci were consistently different in different fields with the same cropping sequence during seven years of observations. Vapam and DD treatments lowered the equilibrium density of R. uniformis on host crops grown afterwards.

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


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