Cultural Control of dyers woad (Isatis tinctoria)
Cultivation and Hand Pulling: Hand pulling and digging out individual parts is usually effective if you can take the time to pull out their up to 5 ft deep roots. You should always try to cultivate (plow or till) in early spring to stop the weed from getting an early start. Destroy new seeds in the fall. Be sure to get ALL of the root because dyers woad can regenerate from its taproot. This method is only effective in smaller populations. (1)
Controlled Burning: No information about this method.
Seeding/Reseeding: This method is not effective because dyers woad spreads by seeding and is very effective at it. When you try to reseed other plants, dyers woad is often the stronger of the two plants (3).
Watering: Not an effective method because dyers woad will survive for years under water (4).
Chaining or bulldozing: Not effective because of the ability of the weed to regenerate after the cutting off of the crown. The weed is only terminated if and only if the whole root is removed so just cutting off the surface does not help and the weed will grow back (2).
Grazing Methods: This method is not commonly used because livestock do not tend to eat it. Although goats have been used to control small outbreaks, this method is not recommended (5).
Mowing: Not effective because the whole root of the plant must be removed to totally terminate the weed (2).
1. "Wanted dead: dyers woad", Oregon Noxious Weed Wed, Hitch Hike 'en Spike, Mar. 9, 2004, <http://oregonweeds.org/weeds/weed_dyerswoad.html>.
2. "Dyers Woad", Noxious Weeds of Mesa County, July 21, 2003, Mar. 9, 2004 <http://www.co.mesa.co.us/pestcontrol/weeds/dyers%20woad.htm>.
3. Dyers Woad, Montana Weed Control Association, Mar. 9, 2004, <http://mtweed.org/Identification/dyers_woad/dyers_woad.html>.
4. "Dyers Woad", Wanted: Dead, Blue Mountains Natural Resource Institute, Mar. 9, 2004, < http://www.fs.fed.us/pnw/bmnri/weed_dyerswoad.html>.
5. "A threat to Montana rangeland", Dyers Woad, Montana State University, Mar. 9, 2004, <http://www.montana.edu/wwpb/pubs/mt9614.html >.
By: Clara Schahczenski 3/10/04
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