This data release provides information about an experimental attempt to manually reduce mosquito larval habitat associated with feral pig damaged, fallen tree ferns (Cibotium sp.) within and adjacent to the current southern sections of the Kona Unit of Hakalau Forest National Wildlife Refuge. The release contains 1) data and metadata files that document pre- and post-treatment mosquito oviposition trap catches within the treatment area, within an adjacent untreated area, and at four elevations along a central access road, 2) coordinates and elevations where oviposition traps were operated in treatment and control areas and along the access road, 3) prevalence of midgut oocysts and salivary gland sporozoites (Plasmodium relictum) and measurement of wing length for mosquitos captured in treatment and control areas and along the access road, 4) field effort in person days, approximate area treated, and numbers of tree ferns that were drained during the control phase of the experiment, and 5) estimates of numbers of tree ferns that were missed and not drained in the treatment area based on a random subset of sixty 50 X50 m plots after the control phase of the experiment was completed. This XML describes five tabular CSV files: (i) Source Reduction Study -Treatment Area Resampling.CSV, and (ii) Source Reduction Study - Hapuu Cutting Data.CSV, (iii) Source Reduction Study - Mosquito Dissections and Measurements.CSV, (iv) Source Reduction Study - Collection Periods.CSV and (v) Source Reduction Study - Mosquito Trap Locations.CSV.