Edge distributions of Ceutorhynchus assimilis and its parasitoid Trichomalus perfectus in a crop of winter oilseed rape (Brassica napus).
The edge distributions of Ceutorhynchus assimilis and its parasitoid Trichomalus perfectus within a crop of winter oilseed rape were investigated between May and July using yellow water-traps arranged on a grid system in Hertfordshire, UK. A randomisation test, which compared the observed arrangement of trap counts with permuted arrangements, was used to quantify the observed tendency of C. assimilis to congregate at the edges as it migrated into the crop; this tendency declined during the season. Trichomalus perfectus were distributed at the edge of the crop only during the early phase of its immigration in May, which occurred later than immigration of its host. It is considered that this simple means of quantifying insects spatial distribution could prove a useful tool in precision targeting of insecticides.