Rust (fungus) Rust (fungus) Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales (previously also known as Uredinales). An estimated 168 rust genera and approximately 7,000 species, more than half of which belong to the genus "Puccinia", are currently accepted. Rust fungi are highly specialized plant pathogens with several unique features. Taken as a group, rust fungi are diverse and affect many kinds of plants. However, each species has a very narrow range of hosts and cannot be transmitted to non-host plants. In addition, most rust fungi cannot be grown easily in pure culture. A single species of rust
Rust Craft Greeting Card Company Rust Craft Greeting Card Company The Rust Craft Greeting Card Company was an American greeting card, printing company and owner of television stations. It produced what is believed to be the first Christmas card. The company was founded in a bookstore in Kansas City, Missouri, in 1906 by its owner, Fred Winslow Rust. The first Christmas card was printed on heavy tan paper and included a brief message in two colors. The success of the Christmas card grew into a business letters, postcards, and greeting cards with envelopes. Rust revolutionized the use of the "French Fold," which turned a single