Problems related to brown plant hopper outbreaks management in the Mekong Delta-Vietnam are complex and need aggregating information across administrative scales. Brown plant hopper density and environmental indicators are main factors that support stakeholders have suitable decision making. Due to detail levels of information are different from field scale to region scale, upscaling information is required, this paper aims at designing an agent-based assessment model and proposes an upscaling method to aggregate and assess information from field to region scales. A case study presents conveying rice area infested by brown plant hoppers across scales and results could help stakeholders assess damage levels caused by Brown plant hoppers in rice crop seasons.