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BiologyAdults are on the wing from mid-March to mid-April and fly at night. Further north, the adults emerge slightly later on in the year. The caterpillars hatch from the eggs laid by the adults, and are active between May and June; the pupal stage then develops, and overwinters (2). The adults emerge the following spring, starting the cycle once again. This type of life-cycle takes a year to be completed, and is known as 'single-brooded' or 'univoltine', as a single generation or brood is produced during that time.