Control of arthropods in animal environments

A method of producing a dry powder composition comprising the steps of

• i) admixing at least one chemical organic compound that is capable of controlling the population of an animal-infesting arthropod species with a liquid hydrophobic carrier substance formed from hydrophobic particles selected from carnauba wax, beeswax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax and rice bran wax,
• ii) allowing the mixture of the liquid hydrophobic carrier substance and the at least one chemical compound of step i) to cool to a solid state;
• and
• iii) at least one of milling and micronising the mixture to form a dry powder;
• wherein the dry powder composition is effective in controlling at least one population of animal-infesting arthropod species and comprises composite particles, and
• wherein the composite particles have a volume mean diameter in the range from 10 microns to 200 microns and comprise:
• i) hydrophobic particles selected from carnauba wax, beeswax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax and rice bran wax, wherein the particles are configured to adhere to the cuticle of one or more species of animal-infesting arthropod and wherein the particles are configured to adhere to fur, hair, feathers or skin of an animal;
• and
• ii) at least one organic chemical compound admixed therewith, wherein the said organic chemical is capable of controlling the population of at least one animal-infesting arthropod species on livestock, domestic pets, poultry, game birds and ornamental birds.