Abstract
The influence of plot size in assessing the impact of pesticide treatment on invertebrate populations in cereals was investigated. Within-field experiments were performed in southern England in winter wheat using the broad-spectrum aphicide dimethoate. Post-treatment recovery was monitored using, in separate experimental designs, pitfall traps in the centre of treated plots of different size from 4 × 4 m up to 288 × 288 m, and pitfall traps in transects running from the edge to the centre of large treated plots. Invertebrate population recovery was shown to be dependent on the size of the plot treated. Two contrasting patterns of recovery were identified: (A) recovery progressing from the edge to the centre of treated areas; (B) recovery most rapid in the centre of the large treated areas
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