White-pine rust is a fungal disease that affects various species of pine trees. It is characterized by yellow-orange spots on the needles, which later develop into brownish-black pustules. If left untreated, this rust can cause defoliation and stunted growth in the trees. There are several synonyms for white-pine rust, including eastern white pine needle rust, white-pine blister rust, and white pine gall rust. These terms are all used interchangeably to describe the same fungal disease. Prevention and control measures include pruning infected branches and maintaining proper tree hygiene. Fungicides also provide effective treatment options for white-pine rust.