Developing an effective glyphosate application technique to control Bischofia javanica Blume, an invasive alien tree species in the Ogasawara Islands

A novel glyphosate application technique, the drill-and-plug method, effectively controls Bischofia javanica, an invasive tree species threatening the Ogasawara Islands' native ecosystems. This approach involves injecting a precise glyphosate dosage into stem holes, sealed with cork stoppers to prevent solution loss. Researchers developed an allometric regression model to determine optimal herbicide dosage based on stem diameter and aboveground biomass (AGB), finding that 0.1–0.5 g kg⁻¹ of active ingredient effectively kills most treated trees. Testing the minimum dosage (0.1 g kg⁻¹) confirmed high efficacy, offering a targeted strategy to curb B. javanica expansion while preserving native biodiversity in this UNESCO-listed site.

Itou, T., Hayama, K., Sakai, A., Tanouchi, H., Okuda, S., Kushima, H., & Kajimoto, T. (2015). Developing an effective glyphosate application technique to control Bischofia javanica Blume, an invasive alien tree species in the Ogasawara Islands. Journal of Forest Research, 20(1), 248–253. https://doi.org/10.1007/s10310-014-0457-y