three seeded mercury weed

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The first thing to do is make sure it never has an opportunity to go to seed. Even though it is a perennial that can come up from the roots, it will also propagate itself by the seeds on those tall bracts. This might be a time to break your rule about never mowing; if you mow it before it can seed, and keep mowing it as it sends up more bracts to try to seed again, you might just wear out the food stored in the roots. Doing this for several weeks when the plant is trying to bloom, and thus set seed, could greatly alleviate your problem.

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From: Austin, TX Region: Southwest Topic: Invasive Plants Title: Removing three-seeded mercury in Austin Answered by: Barbara Medford.

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Well, you may have to learn to like Acalypha phleoides (shrubby copperleaf), or be more aggressive. It is native to this part of the state, and therefore very adapted to the rainfall, climate and soil. Since it is perennial, just pulling it off the root is not going to stop it from coming back up, as you have already pointed out. You can't spray it with herbicide, as it would kill all the other dicots or broad-leaved plants (like the straggler daisy) that you already have. If you buy a spray that is for monocots, or grasses, it won't bother the three-seeded mercury, but it could kill some native grasses that you have been cultivating.

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Beyond that is the somewhat labor-intensive, hands and knees on the ground, method of painting the cut stem with a wide spectrum herbicide. Begin with a small bottle of the herbicide and some disposable sponge brushes. Cut each stalk off near the root and quickly, within five minutes before the stalk starts to heal over to protect the roots, paint the cut edge with the herbicide. Be very careful, spilling this could contaminate the soil and kill the other plants, broad-leaf and grasses, and don't spray, for the same reason. This plant is monoecious, which means it has both male and female flowers on each plant, and each plant can carry on creating more plants with no outside help.

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QUESTION:

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Table 2 is based on 3 field trials in Ontario conducted by Peter Sikkema.

In the seedling stage this weed is often confused with redroot and green pigweed. It is distinguished from pigweed species by its glossy bronze-green leaf colour, leaf margins with irregular, rounded teeth and clusters of greenish flowers at each axil. In addition Three-seeded mercury has round cotyledons, whereas green and redroot pigweed has very long and slender cotyledons.

Weed Stage: Three-seeded mercury had not emerged at the time of any pre-emergent applications and was in between the cotyledon to 8 leaf stage at the time of all post-emergent applications.

Post-Emergent Control in Corn.

Source: Dr. Peter Sikkema and Dr. Clarence Swanton, University of Guelph.

We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

Again, products containing the active ingredient atrazine as well as Distinct, PeakPlus and Summit provide effective control of emerged three-seeded mercury (Table 2). Pardner or Koril (applied alone) and Banvel II do not control three-seeded mercury.

A member of the spurge family. Three-seeded mercury has become a serious weed in agricultural fields where group 2 herbicides (e.g., Pinnacle, Pursuit etc.) have been repeatedly used. This weed can cause serious crop losses in cereal, corn and soybean fields.

A pre-emergent herbicide containing the active ingredient atrazine will provide very good control of three-seeded mercury (Table 1).

Three-seeded Mercury Pictures.

Number of Trials:

Distinguishing Characteristics.

Table 2 is based on a summary of 6 field trials in Ontario, 4 conducted by Dr. Peter Sikkema and 2 conducted by Dr. Clarence Swanton.

Herbicide Rates: Rates used in this trial are listed in OMAF Publication 75 – Guide to Weed Control.

Number of Trials:

Control of three-seeded mercury has been fairly inconsistent with many of the post-emergent herbicides. FirstRate and Classic would appear to be the best option for post-emergent control of this weed.

If growing no-till soybeans, a pre-plant glyphosate burndown should control any emerged seedlings. FirstRate or the high rate of Sencor should provide excellent residual control of three-seeded mercury. Broadstrike Dual Magnum has proven to be inconsistent as it has offered excellent control in some trials, while performing poorly in others.

What has been your experience?

We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

Table 1 is based on 4 field trials in Ontario, 2 conducted by Dr. Peter Sikkema and 2 conducted by Dr. Clarence Swanton.

Herbicide Rates: Rates used in this trial are listed in OMAF Publication 75 – Guide to Weed Control.

Table 1 is based on a summary of 1 field trial in no-till soybean.

Annual, reproducing only by seed.

Source: Dr. Peter Sikkema and Dr. Clarence Swanton, University of Guelph.

According to the Southern Living Garden Problem Solver , which may or may not have misclassified this as Acalypha virginica (my plant definitely doesn’t look like the one shown by Illinois Wildflowers.info), many insects love to feed on the leaves. Thus, my sample, with its raggedy, chewn leaves should be pretty typical.

This summer annual weed is not a nuisance, except that there’s a lot of it in my garden. It doesn’t reseed aggressively like hairy bittercress and it’s not difficult to eradicate. Despite the taproot, the plants are easy to pull. They are also said to be browsed by deer (not if there are phlox and hosta to eat, they’re not).

This annual member of the Euphorbiaceae family starts as a thin, erect reddish stem with narrow leaves, about an inch to an inch and a half long, arranged opposite along the stem. As it grows, it branches, and leaves are arranged alternately. Here is where my ignorance of botany is exposed:There appear to be small yellow flowers at the leaf axils, but those yellowish bits I see could be bracts, or technically it might be an inflorescence …anyway, if you care to read details about the plant’s structure, you can read the description from the University of Guelph extension, or the Wikipedia site. For me, right now, I know I’m fairly close to identifying the plant.

Finally, I know who this fellow is, sort of. Acalypha… somebody, probably rhomboidea , commonly known as three-seeded mercury. He and his brothers are everywhere in my garden.

The seeds are supposed to be choice food for mourning doves, whom I would gladly welcome to my garden because I love their call. The buffet is open!