uredinial
/jʊrɪˈdɪniəl/
adjective
- Relating to the spore-producing stage of rust fungi, typically appearing as reddish or orange pustules on plants.
- Uredinial spores are often produced in large numbers during warm, humid weather.
- Gardeners may notice uredinial growth on the undersides of leaves.
- The uredinial stage is critical for the spread of rust diseases in agriculture.