First record of Hyposoter placidus (Desvignes, 1856) (Hymenoptera: Ichneumonidae) in Poland: the specialized parasitoid of Lycaena Fabricius, 1807 butterflies (Lepidoptera: Lycaenidae)

Adult ichneumonids of Hyposoter placidus were reared from caterpillars of the large copper butterfly Lycaena dispar collected in NE Poland, feeding on Rumex confertus, R. hydrolapathum and R. obtusifolius . This is the first record of this parasitoid in the country. We hypothesize that H. placidus may be a factor limiting the abundance of populations of L. dispar , a widespread species but usually occurring in low...