A univoltine species with an extended flight period. There is a shortage of data in Germany, but In Switzerland, overwintered females emerge in mid-April and fly until September. The males emerge at the end of June (Amiet et al., 2001).
Mavromoustakis (1948) reports adult flight activity in August
Label data from a few Spanish specimens show that females are active from (at least) May to July, and males in July (Ortiz-Sanchez & Pauly, 2017).