Abstract
In southern Benin the temporal dynamics and adult movement of Clavigralla tomentosicollis Stal were investigated in cowpea fields during 1991 and 1992 by counting and mark—recapture methods. The phenology and adult movement of this pest were related to the pod and seed formation period. A rapid colonization by immigrating adults closely coincided with the pod formation phase of the plants. Oviposition occurred at the beginning of pod maturation and was succeeded by an increase of the nymphal density until pod harvest. The analyses of adult movement yielded daily emigration rates of 7—20% of the resident adult densities, whereas the daily percentage of in situ adult mortality was <5%. The decline in the number of adults toward harvest time is therefore mainly caused by emigration rather than to field mortality. The high mobility of C. tomentosicollis and the rapid field colonization are important elements in the planning of adequate pest management strategies.
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