Modification of crystal II of fipronil and fipronil solid, process for preparing the crystalline modification II mixture pesticide or parasiticide sinergu00cdstica pesticide or parasiticide, composition, use of the crystalline modification of fipronil II, or solid form, or a mixture, or the composition, M. u00c9todos to control pests, to protect a plant of infestau00c7u00c3o and attack by pests, to protect the seed.And for treating, controlling, prevent or protect animals against infestau00c7u00c3o or infection by parasites, seed, use of the modification crystalline II, or fipronil solid form, or a mixture, or the composition, and process for the preparation of a composition for trtar, control, prevent or prot Eger animals against infection by parasites or infestau00c7u00c3o