Post-harvest population reservoirs of Coffee Berry Borer, Hypothenemus hampei (Coleoptera: Curculionidae) on Hawai‘i Island

Coffee Berry Borer, Hypothenemus hampei Ferrari (CBB), is the most damaging insect pest of coffee worldwide. Old coffee berries (raisins) are widely acknowledged as CBB reservoirs, yet few studies have attemped to quantify CBB populations in raisins remaining on farms post-harvest. We collected ground and tree raisins at six coffee farms on Hawai‘i Island to assess raisin density, infestation, CBB abundance, and adult mortality in three areas of each farm: trees, driplines (ground below the tree foliage), and center aisles (ground between tree rows). We also assessed infestation of the new season’s crop by conducting whole-tree counts of infested green berries. Mean raisin density was significantly higher in the dripline compared to the center aisle and trees (131 vs. 17 raisins/m2 and 12 raisins/tree, respectively). Raisin infestation was significantly higher in samples from trees (70%) relative to those from the dripline (22%) and center aisle (18%). Tree raisins had significantly hig...