Use of particles in controlling a population of arthropod pests, wherein the particles comprise i) a hydrophobic exterior that adheres to the cuticle of at least one species of an arthropod pest and ii) at least one pesticide associated with the said particles, wherein the pesticide is present at a weight of less than 2% of the weight of the particles, populations of particles, methods of producing populations of particles and methods of application of such populations. The exemplified hydrophobic exterior is carnauba wax particles with a volume mean diameter up to 200µm. The exemplified pesticide is pirimiphos-methyl. A population of particles, a method of producing a population of particles and a method of controlling grain storage arthropod infestation are also claimed. The exemplified application is the control of the sawtooth grain beetle (Oryzaephilus surinamensis).
