Disease in plants characterized by reddish discoloration of leaves, stems, or other parts, esp. in the form of blister-like, reddish-brown (or…

The development of the disease rust, or of reddish discoloration, in (a part of) a plant (cf. rust, n.1 6a); an instance of this.

Corrosion on the surface of metal, spec. verdigris or rust. Now English regional.

any of several plant rusts producing black discoloration, esp. the winter or teliospore stage of Puccinia graminis, a serious pathogen of wheat…

The plant disease rust, as affecting a cereal crop. Also: damage caused to wheat by larvae of the wheat midge. Obsolete.

the summer or uredial stage in any of various fungal rusts, esp. those infecting cereal crops.

= sense A. 6a.

= red rust n. at red, adj. n.compounds 1f(c)(i). Now historical and rare.

The plant disease rust, as affecting a cereal crop. Obsolete.

the pathogenic fungus Puccinia coronata, which causes a rust disease of grasses, including oats and many forage grasses; (also) the disease caused…

The state, condition, or quality of being rusty (in various senses of rusty, adj.1); rust.

any of various fungus diseases of plants that produce spots on the stems; esp. that caused by Puccinia graminis on wheat and other cereals, marked…