Abstract
A deterministic model of the European red mitePanonychus ulmi (Koch) and its predatorTyphlodromus pyri Scheuten is presented. The model is driven by daily maximum and minimum temperatures, and requires the per-leaf densities of both mites in spring to start each simulation. It was successful at predicting the general change in mite populations, and the peak prey density, but deviations from field results occurred at low prey density. Simulations have suggested that the present miticide spray thresholds used in New Zealand are too conservative and have also provided further insight into integrated control ofP. ulmi.
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