Host plants:
The caterpillar is basically polyphagous. Oviposition takes place generally on woody plants (apparently mainly ash - Fraxinus). I collected the young caterpillars along with those of Atethmia centrago with ash flowers. Later, the caterpillar lives in the herb layer. I found a half-grown caterpillar during the day feeding on Lathyrus pratensis under an ash tree, along with those of Zygaena osterodensis and quite close to the ground.
Habitat:
Agrochola macilenta is a forest ihabitant and lives as a caterpillar in internal edges, on clearings and along trails.
Life cycle:
The eggs overwinter on twigs and the caterpillars live from April to mid-June. The moths fly from the end of August (usually not until September) to early or mid-November.
Remarks:
The distribution extends across large parts of Europe and Western Asia.