On the biology of Otoblastus luteomarginatus (Gravenhorst, 1829) and Polyblastus tuberculatus Teunissen, 1953 (Hymenoptera: Ichneumonidae: Tryphoninae)

<p>Field observations of Otoblastus luteomarginatus (Gravenhorst, 1829) and Polyblastus tuberculatus Teunissen, 1953, conducted in northern Germany from 2016 to 2025, are summarised. New knowledge on host association is provided for both species, as well as other details on their biology.</p>