It is possible to repel arthropod by applying 4-hydroxy-6-methyl-3-(4- methylpentanoyl)-2-pyrone of formula: ##STR1## to a place where it is desired to repel arthropods.

É possível repelir o artrópode aplicando 4-hydroxy-6-methyl-3-(4- methylpentanoyl)-2-pyrone da fórmula: ## do ## STR1 a um lugar onde se deseje repelir artrópodes.