Abstract
The abundance and effectiveness of Pareuchaetes pseudoinsulata Rego Barros (Lepidoptera:Arctiidae) in controlling the Siam weed, Chromolaena odorata (L.) King and Robinson in southern Ghana wasassessed in C. odorata infested fields through monthly sampling and monitoring surveys carried out between October 2007 and March 2008. Insect data was collected using line transects of 100 metres long and 100 metres apart and the removal, sweep net and direct count methods were used and data on the impact of feeding damage on the weed was collected by measuring several plant characteristics. The populations of P. pseudoinsulata were generally low in allsites investigated, throughout the study period. However, higher numbers of the bio-agent were recorded at site #1 (Akotokyire, Central Region) compared to the other sites and this was significantly (P
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