Like all cynipids, they make galls on plants and are specific with regard to host species and tissue. Four plant genera, all asteraceous, are used by the wasps, of which Chrysothamnus, Lygodemnia, and Microseris are known to host one Antistrophus species each whereas Silphium host the remaining seven species.ike all cynipids, they make galls on plants and are specific with regard to host species and tissue. Four plant genera, all asteraceous, are used by the wasps, of which Chrysothamnus, Lygodemnia, and Microseris are known to host one Antistrophus species each whereas Silphium host the remaining seven species.