The present invention relates to a dust composition comprising at least one insecticide selected from GABA antagonists and at least one organic carrier selected from celluloses and cellulose derivatives. The invention further relates to the use of the dust composition for combating insects and to a method for controlling insects by bringing them, their food supply or their habitat, or the materials, soils, surfaces or spaces to be protected from insect attack or infestation into contact with the dust composition. The invention also relates to a method for protecting wood material from termite attack or infestation by bringing the wood material to be protected or a soil, surface or space near the wood material to be protected into contact with the dust composition.