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BiologyThe Drab Looper is usually single-brooded and the adults fly in May and June. Sometimes a second brood is produced, the adults of which fly in August. Eggs are laid in June (4), the caterpillars are present from July to early September, and the overwintering stage is the pupa (2), which occurs below the soil surface (4). The adults emerge the following year in May and June (4) and can be seen flying in sunshine (2).