- Leaf rust is caused by the fungus.
- The first signs of the disease (sporulation) occur 10-14 days after infection
- Leaf rust produces reddish-orange colored spores that occur in small, 1.5 mm, circular to oval-shaped pustules.
- These are found on the top surface of the leaves, distinguishing leaf rust from stem rust which is found on both surfaces of the leaf.
- The spores require 15 to 20ºC temperature and free moisture (dew/rain/irrigation) on the leaves to successfully infect wheat.