Abstract
The movement of adult apterous cacao weevils, Pantorhytes szentivanyi Mshl. (Coleoptera: Brachyderinae) marked with scandium—46 was studied in cacao plantations with open or closed canopies. A diffusion model of dispersal was used to calculate diffusivities (D). These were higher in a closed canopy (D = 0.75 m2/day) than in open canopy (D = 0.16 m2/day). This reflects the more rapid dispersal occurring when the branches of adjacent trees are touching. In a closed canopy plantation, the calculated probable distance moved by any individual in a month was 14—25 m (P = 0.1 — 0.001).
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