A dry powder formulation comprising spores of an entomopathogenic fungus that has activity against arthropods that infest dry commodity storage areas, wherein the spores are present in an amount of 2 to 5% w/w of the formulation； particlesof an industrial mineral in an amount of 80 to 88% w/w of the formulation and having a volume mean diameter of >；5µm； and electret particles in an amount of 10 to 15% w/w of the formulation, and uses thereof. The industrial mineral is selected from clays, sand, gravel, diatomite, diatomaceous earth, kaolin, bentonite, silica, barite, gypsum and talc or a mixture thereof. The exemplified formulation comprising conidia of Beauveria bassiana, kaolin and carnauba wax particles.
