''Caloptilia populetorum'' (commonly known as clouded slender) is a moth of the family Gracillariidae. It is found in most of Europe, except Italy, the

Balkan Peninsula The Balkans ( ), also known as the Balkan Peninsula, is a geographical area in southeastern Europe with various geographical and historical definitions. The region takes its name from the Balkan Mountains that stretch throughout the who ...

and the

Mediterranean islands The following is a list of islands in the Mediterranean Sea. The two main island countries in the region are Malta and Cyprus, while other countries with islands in the Mediterranean Sea include Italy, France, Greece, Spain, Tunisia, Croatia, ...

. The wingspan is . The forewings are whitish ochreous, irregularly tinged and clouded with fuscous; margins dotted with black; a small black spot on middle of costa blackish dots on fold at 1/3 and 2/3. Hindwings are dark grey. The larva is green-whitish; head very pale brownish.Meyrick, E., 1895 ''A Handbook of British Lepidoptera'' MacMillan, Londo
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Keys and description Adults are on wing from August onwards, overwintering after which they may be seen until April or May. Although the scientific name ''populetorum'' might suggest the larvae feed on poplar, they only feed on the leaves of '' Betula'' species, including '' Betula pendula'' and '' Betula pubescens''. Initially they feed in a gallery and later they roll a leaf and feed within.

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Leafminers and plant galls of EuropeUK Moths
populetorum Moths of Europe Moths described in 1839 {{Caloptilia-stub