Phyllonorycter grewiaecola is a moth of the family Gracillariidae. It is known from Namibia, South Africa, ZimbabweGlobal Taxonomic Database of Gracillariidae (Lepidoptera) and Kenya. The habitat consists of savannah areas at altitudes between .
The length of the forewings is .Systematics, revisionary taxonomy, and biodiversity of Afrotropical Lithocolletinae (Lepidoptera: Gracillariidae) Adults are on wing from February to August.
The larvae feed on Grewia kwebensis and Grewia tristis. They mine the leaves of their host plant.
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