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4.039 ~ 0073 ~ Stigmella trimaculella ~ Black-poplar Pigmy
UK Status

Resident. Widely distributed in England, but patchy & uncommon in Scotland & Wales.

Montgomeryshire Status

Discovered in Llanfyllin in the north of the county in 2019.

Wingspan :   M & F, 5-6mm.

Confusion species

Many species in this group are very similar. One of the best ways of separating them is to examine the type of leaf-mine.
Flight time & Voltinity (Bivoltine)


Wherever the foodplant is found.


Black poplar.

Lifestage data

Leaf miner. Eggs either side of leaf. Larva forms a slender gallery, later widening into a blotch. Pupa: orange to dark brown.
Montgomeryshire photos

Photo by DHB, 1st Sept 2019, Llanfyllin
Pic shows mines on black poplar