Due to the previous confusion with Blondelia nigripes, the biology of the present species is incompletely known. It is an exclusive parasitoid of the pine processionary moth species Thaumetopoea pinivora and Thaumetopoea ispartaensis. Bergstrom and Bystrowski (2011) summarize all available data and suggest that the species is univoltine and adults may be found mainly in May, June and July, but a few specimens have also been reported in August and September. Females deposit one to three eggs per host larva. The parasitoid larva lives inside the host larva until the host larva moves into the ground and forms a cocoon during pupation. Then the parasitoid kills the pupa and apparently pupates inside the host cocoon and overwinters as a pupa inside the host cocoon.