Absinth does not tolerate frequent disturbance, and is therefore rarely a problem in annual crops. Absinthe wormwood requires disturbance to establish. Application early in the growing season typically results in poor control. For the Russian knapweed, Chaparral at 3 ounces is pretty good, too. Spotted Knapweed, Absinth Wormwood – Tordon at 1 quart/acre or 7 ounces of Milestone. Absinth Wormwood. Seed production is only reduced as the plant then sends out horizontal stems that will also set seed. At this time, chemical control is the only option available to treat absinth wormwood. Seeds are easily transported in hay, water and by animal/human traffic.1 It can be easily con-trolled by competitive vegetation or herbi-cides.1,2 Because growing buds are at top of root crown it may be killed by fire.1 Control: Herbicides become less effective as wormwood matures (greater than 8 – 12 inches tall) or during dry periods. It did provide some top-growth control, but absinth actually increased from an average of 8.3 per cent before treatment to 10.6 per cent of the canopy a year later, suggesting that multiple applications would be necessary. • Glyphosate applied at 0.75 and 1.5 pounds of acid equivalent per acre (lb ae/A) (1 to 2 quarts of 3 lb ae /gallon formulation) provided greater than 92 percent control of all sizes of biennial wormwood seedlings. Research in now underway to find biological agents to control absinth wormwood. Control of biennial wormwood with Basagran® applied once and twice (split-application). Mechanical and Cultural Control Absinth wormwood is on the state's list of noxious weeds - those required by law to be controlled. We’ve had the best luck with Tordon at 1 to 2 quarts/acre (I’d suggest staying toward the higher rate). Biological Control. Absinth wormwood control was evaluated visually using percent stand reduction compared to the untreated control. Wormwood is an herb that has been historically used in absinthe and long thought to cause hallucinations. An integrated pest management plan can be developed to manage, contain and eradicate the invasive species before it can spread further, avoiding costly, long-term control efforts. Absinth wormwood is an aggressive weed and requires fall or early spring control. Also known as American wormwood, common wormwood, mugwort, madderwort and wormwood sage, absinth wormwood was first brought to this country in the early 19th century from Europe where it is cultivated for medicinal purposes, as an ornamental plant and as a flavoring. Artemisia absinthium (wormwood, grand wormwood, absinthe, absinthium, absinthe wormwood, mugwort, wermout, wermud, wormit, wormod) is a species of Artemisia native to temperate regions of Eurasia and Northern Africa and widely naturalized in Canada and the northern United States. Mowing prior to the plant setting seed helps control its spread. All treatments that contained aminopyralid or clopyralid provided 90% or better absinth wormwood control36 months after treatment (MAT) whether applied in June or September (Table 1 ). There are no biological control agents available for absinth wormwood at this time. This article explains everything you need to know about wormwood… Herbicides should be applied when the plant is 1 foot tall and actively growing. Goehring says each plant produces several thousand seeds and can also reproduce by its roots. Control. Absinth wormwood will quickly grow and spread, so it is important to learn how to identify the plants, begin control measures immediately, and hope absinth wormwood can be controlled before it gets a chance to spread across Nebraska. Herbicides are recommended to control absinth wormwood. Healthy pastures and plant com-munities are wormwood-resistant. All except 2,4-D reduced the percentage of absinth. Russian Knapweed and Dalmatian Toadflax – These weeds are really tough. 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