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The spatial niche occupation of the Asian citrus psyllid,  Diaphorina citri  Kuwayama, 1908, was evaluated to determine its field colonization and food resource exploitation strategies in citrus groves. Mature grapefruit and sweet orange groves were surveyed as part of an area-wide program in 2009–2010 to determine  D .  citri  population densities and between-tree distribution. In both cultivars, significantly more psyllids were found on perimeter trees throughout the study period suggesting a strong edge effect in  D .  citri  distribution in the groves.  D .  citri  densities and infestation levels gradually declined from the edge to the center of grove. Higher numbers of  D .  citri  were recorded on trees located on the east and south sides of the groves than those on the west and north sides. Citrus groves located at the outer edge of the study with at least one side non-surrounded to other citrus groves harbored significantly more  D .  citri  than groves located within the block cluster and entirely surrounded by other groves. In detailed field studies during 2012, infestation of  D .  citri  started from border trees in the grove where possibly one generation is completed before inner trees become infested. In addition, psyllid densities decreased significantly with increasing distance from the grove edge. Using the selection index,  D citri  exhibited a strong niche occupation preference for border trees.

Living on the Edges: Spatial Niche Occupation of Asian Citrus Psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), in Citrus Groves