Albugo occidentalis Albugo occidentalis Albugo occidentalis, the causal agent of Spinach White Rust, is an oomycete plant pathogen, although some discussions still treat it as a fungal organism. "Albugo occidentalis" is one of the most important spinach diseases in North America, found throughout the United States east of the rocky mountains. The economically important host of "Albugo occidentalis" is spinach (Spinacia oleracea); although the oomycete has also been reported to affect plants of the genus Chenopodium, the genus including the crop plant quinoa. This pathogen causes white rust or white blister of spinach. It is unrelated to the basidiomycete rusts biologically, but
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