rust fungus

rust fungus (plural rust fungi)

1. Any of many fungi, of the order Pucciniales, that cause rust diseases in plants.
   • 2005, Ming Hao Pei, Alistair R. McCracken, editors, Rust Diseases of Willow and Poplar, CABI, →ISBN, page 170:

     In the substomatal chamber all the signals that regulate the interaction between fungus and host are present along the entire structure of the rust fungus, from the vesicle to the first haustorium which, in the dikaryotic stage, is the first intracellular structure (Mendgen et al., 1988; Heath, 1989, 1995).