Abstract
The influence of the spatial pattern of insect pest infestation on the form of the relationship between crop yield and pest density (the yield-loss curve) is investigated. A graphical model of the relationships between yield, crop injury and pest density is developed. The model is extended to include the effects of both the density and the spatial pattern of a pest infestation on crop yield. It is shown that the form of the yield-loss curve depends on the way in which the density of a pest infestation and its spatial pattern are associated.
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