THE RELATION BETWEEN NEMATODE DENSITY AND DAMAGE TO PLANTS BY J. W. SEINHORST Institute for Phytopathological Research, Wageningen, Netherlands An equation for the relation between the density of stem nematodes or virus transmitting nema- todes in the soil and the proportion of attacked plants can be derived if two suppositions are made: 1. the "average nematode" is the same at all densities. 2. the nematodes act independently of each other. If now y = the proportion of the plants that is not attacked and P = the density of the nematode then In this equation z is a constant < 1 and equal to the proportion of the plants not attacked at a nematode density P = 1 (competition curve of Nicholson). The results of a pot experiment by Sayre & Mountain and field observations by Kaai are in close agreement with this equation. To describe the relation between the density of populations of root infesting nematodes and the yield of attacked plants an equation must express two phenomena: 1) Up to a certain density (the tolerance limit) the yield is not affected (damage only to tissue that is not essential to the growth of the plant, power
Nematologica – Brill
Published: Jan 1, 1965
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