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Abstract
The effect of woodlots, natural areas and agricultural land in the landscape on a generalist herbivore insect species in cropland was investigated. The abundance of onion thrips ( Thrips tabaci) was compared in leek ( Allium porrum) fields in 43 agricultural landscape plots of different sizes in The Netherlands. The total area of woodlots, other natural and agricultural areas within a radius of 1000 and 5000 m around each field was measured using a geographic information system (GIS) framework, LGN3 plus. Numbers of onion thrips were significantly lower in leek fields in agricultural landscapes with a larger total area of woodlots. The results suggest that woodlots decrease density of onion thrips and their symptoms in leek fields. Possible mechanisms are discussed.
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