Abstract
A differential equation is used to simulate the population dynamics of the sugar beet cyst nematode Heterodera schachtii in rotations comprising host and non-host crops. Transition probabilities between developmental stages are formulated as density dependent. The number of generations within one year is determined by the prevailing environmental conditions. The parameter set is calibrated to standard cropping systems. Although the structure of the model is kept simple, the model output compares well with different sets of experimental field data. The model can be used to forecast realistic long-term changes of nematode density in sugar beet rotations.
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