Phyllonorycter grewiella is a moth of the family Gracillariidae. It is known from South Africa,[1] Botswana, Kenya, Namibia and coastal Yemen. The habitat consists of the coastal savannahs of southern and East Africa and the forests belonging to the Zanzibar-Inhambane floristic region.
The length of the forewings is 2.4–2.8 mm. Adults have been reared and collected during every month of the year except August, October and December.[2]
The larvae feed on Grewia bicolor, Grewia flava, Grewia flavescens, Grewia hexamita, Grewia messinica, Grewia monticola and Grewia villosa. They mine the leaves of their host plant.