Treatment of plants using systemic herbicides and pesticides is achieved using a liquid formulation for applying to aerial parts of the plants, the formulation comprising i) a non-arthropod systemically-acting pesticide； and ii) carrier particles including at least an outer surface comprising an organic matter constituent, wherein the said systemically-acting pesticide is combined within and/or on the surface of the carrier particles, the carrier particles being in particulate form and capable of carrying an electrostatic surface charge.
