Host plants:
I recorded the larva on Scrophularia peyronii in Cyprus.
Habitat:
Cucullia barthae inhabits gravelly areas along rivers and steep slopes with the host plants.
Life cycle:
The moths are on the wing between late February (e.g. Cyprus February to April) to May. The larvae are sometimes already mature in mid-April in Cyprus (in 2017 along the river Diarhizos south of Mamonia), but usually live between late March and June. I recorded up to 10 larvae on one bush of host plant., often accompanied by Cucullia verbasci.
Remarks:
Cucullia barthae occurs from Turkey to Iran and into the Levant (including Cyprus).