A link today to an article in the newest issue of the California Weed Science Society (CWSS) Research Update and News. (June 2013, Vol 9, Number 2) edited by UC Farm Advisor Steve Orloff.
This issue has an article entitled: "Invasive stinkwork (Dittrichia graveolens) is spreading quickly in California" by Joe DiTomaso and Rachel Brownsey. This article is a distillation of a couple years of research that Rachel did while completing her MS degree at UC Davis. A more comprehensive report on her research has also been published in the journal California Agriculture (Cal Ag. 67:110-115)
Brad
Invasive stinkwort (Dittrichia graveolens) is quickly spreading in California
by Joseph M. DiTomaso and Rachel Brownsey
Dittrichia graveolens, commonly known as stinkwort, is a member of the Asteraceae (sunflower family). It is native to the Mediterranean region of Europe and occurs as far east as Turkey, Afghanistan, and Pakistan. Stinkwort is similar in many respects to tarweeds (Centromadia, Hemizonia and Holocarpha), though it is more closely related to Conyza and Heterotheca. From a distance, however, it can resemble Russian-thistle (Salsola tragus), also called tumbleweed. Like the tarweeds, it is an erect winter annual to about 2.5 feet tall, with sticky glandular-hairy and strongly aromatic foliage. The flowerheads consist of short yellow ray flowers and yellow to reddish disk flowers. Stinkwort is an unusual winter annual because it does not begin to grow rapidly until about July. Unlike most late season winter annuals, or even summer annuals, stinkwort flowers do not produce seed until September and continue to flower until December.... ..... Click here for the full article in the CWSS Research Update and News.
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