Fuente: WIPO "varroa" The present invention relates to compositions for the modulation of acarid infestation of a colony of bees, said comprising alkenes selected from the group consisting of cis-6-heptadecene, cis-7-heptadecene, cis-8-heptadecene, cis-9-heptadecene, cis-6-pentadecene, cis 7-pentadecene, cis-8-pentadecene and cia-9-pentadecene, in particular comprising cis-8-heptadecene. The invention further relates to use of cis-8-heptadecene as an acaricide, and to methods of modulating mite infestation.