Phyllonorycter didymopa is a moth of the family Gracillariidae. It is known from South AfricaGlobal Taxonomic Database of Gracillariidae (Lepidoptera) and Namibia.

The length of the forewings is 2.9–3.2 mm. Specimens were reared from mines collected in mid-January and mid-March.Systematics, revisionary taxonomy, and biodiversity of Afrotropical Lithocolletinae (Lepidoptera: Gracillariidae)

The larvae feed on Dombeya rotundifolia. They mine the leaves of their host plant. Later it creates a gall-like swelling near the base of the disc.

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