Fuente: WIPO "varroa" It relates to a strip (10) for releasing an antiparasitic composition to bees to control Varroa in beehives. The strip (10) has a surface (A) to be impregnated with an antiparasitic composition having through openings (21) for receiving the substance having a first portion and a second portion (22, 23) for the substance and an intermediate portion (24) between and narrower than the first and second portions (22, 23). A cross-section of the interior of the through openings (21) includes walls (21a, 21b) sloped at an angle (α) to each other. It also relates to a ready to use product comprising the strip (10) and a veterinary antiparasitic composition for the treatment or prevention of a parasitic infection in a beehive.