Adela croesella is a moth of the family Adelidae. It is found in most of Europe.
The wingspan is 11–14 mm. The head is ferruginous mixed with black. The antennae in male 2.5 [the length of the forewing], black, the tip white ; in female hardly 1.5, thickened with violet-black scales to above middle, remainder white. The forewings are shining dark violet fuscous, more or less streaked suffusely between veins with golden-ochreous with a straight deep yellow fascia close beyond middle, narrower costally, edged first with dark fuscous and then with narrow violet fasciae. The hindwings are dark purplish fuscous.[1] [2] [3] [4]
Adults are on wing from late May to June. They are on wing during the day in sunshine and visit flowers.[14.7 x 21.2 cm]At first, the larvae probably feed on flowers of Hippophae rhamnoides or Ligustrum vulgare. Older larvae built a portable case from leaf fragments and particles of soil and feed on fallen leaves.