Phyllonorycter manzanita is a moth of the Gracillariidae family. It is known from California, United States. The larvae feed on Arctostaphylos glauca and Arctostaphylos manzanita. They mine the leaves of their host plant. The mine has the form of a grayish blotch mine, with the upper epidermis loosened and elevated, but at no stage wrinkled. This leads to a somewhat inflated mine in which most of the parenchyma is consumed.