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rust (in botany)

rust, in botany, name for various parasitic fungi of the order Uredinales and for the diseases of plants that they cause. Rusts form reddish patches of spores on the host plant. About 7,000 species are known. Some grow entirely on one plant; others require two hosts, plants of two species, in order to complete their life cycles. Cedar rust, for instance, grows on cedar and on apple trees, needing both for development. Blister rust of pine grows on pines and either currant or gooseberry bushes. Black stem rust Puccinia graminis is one of the most destructive to wheat, rye, and other grasses; barberry is an alternate host. A new strain of stem rust identified in 1999 is devastating to even rust-resistant wheat strains. Rusts attack all cereal crops and many fruits, vegetables, forage crops, ornamental plants, and forest trees. Rusts are hard to eradicate; control measures include the use of rust-resistant varieties of seed and the elimination of alternate hosts in agricultural areas. Rusts are classified in the kingdom Fungi, phylum (division) Basidiomycota, order Uredinales.

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"rust (in botany)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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rust

rust / rəst/ • n. 1. a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, esp. in the presence of moisture. ∎ fig. a state of deterioration or disrepair resulting from neglect or lack of use: they are here to scrape the rust off the derelict machinery of government. 2. a disease of plants that results in reddish or brownish patches, caused by a fungus (Puccinia and other genera, order Uredinales, class Teliomycetes). 3. a reddish-brown color: [in comb.] his rust-colored hair. • v. [intr.] be affected with rust: the blades had rusted away | [as adj.] (rusting) rusting machinery. ∎ fig. deteriorate through neglect or lack of use. DERIVATIVES: rust·less adj.

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"rust." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"rust." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rust-1

"rust." The Oxford Pocket Dictionary of Current English. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rust-1

rust

rust Corrosion of iron or its alloys by a combination of air and water. Carbon dioxide from the air dissolves in water to form an acid solution that attacks the iron to form iron (II) oxide. This is then oxidized by oxygen in the air to reddish-brown iron (III) oxide. Rusting may be prevented by galvanizing.

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rust

rust A plant disease caused by a fungus of the class Urediniomycetes. The characteristic symptom is the development of spots or pustules bearing masses of powdery spores which are usually rust-coloured, yellow, or brown. Infected plants may also show distortions or gall-like swellings. Compare white rust.

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"rust." A Dictionary of Ecology. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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rust

rust A plant disease caused by a fungus of the class Urediniomycetes. The characteristic symptom is the development of spots or pustules bearing masses of powdery spores which are usually rust-coloured, yellow, or brown. Infected plants may also show distortions or gall-like swellings. Compare WHITE RUST.

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"rust." A Dictionary of Plant Sciences. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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rust

rust In botany, group of fungi that live as parasites on many kinds of higher plants. Rusts damage cereal crops and several fruits and vegetables. They have complex life cycles that involve growth on more than one host plant.See also fungus

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rust

rust brownish coating formed on iron and steel by oxidation. OE. rūst = OS., (O)HG. rost, (M)Du. roest, rel. to RED.
Hence vb. XIII. rusty (-Y1) OE. rūstiġ.

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"rust." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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rust

rustadjust, august, bust, combust, crust, dust, encrust, entrust, gust, just, lust, mistrust, must, robust, rust, thrust, trust, undiscussed •stardust • sawdust • angel dust •bloodlust • wanderlust • upthrust

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"rust." Oxford Dictionary of Rhymes. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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