Rust (on plants)

Rust (on plants)

Most of the fungi known as “rust” attack ornamentals. Each is specific to a certain type of plant, although some cedar apple rust, for example, require two hosts. The spores are spread by wind and splashing water.


Many plants, including roses, hollyhocks, and snapdragons; lawns. 


Rust first appears as pustules on the undersides of leaves; the lesions are usually orange-yellow in color, but may also be brown or purple. Eventually, the upper leaf surfaces become mottled with yellow. Severely infected plants are stunted and may die. 


Resistant varieties, sanitation, good air circulation, and fungicides. 


Clean up fallen debris; remove rust-infected leaves remaining on plants. Water overhead only in the morning on sunny days.

Bonide Solutions