How do you treat or kill large areas of Dallisgrass, to rid it from your lawn?

Lawn care Asked by Taco71 53 months ago Similar questions: treat kill large areas Dallisgrass rid lawn Home.

Similar questions: treat kill large areas Dallisgrass rid lawn.

Here's how to control it "MANAGEMENT A major component of dallisgrass management is to prevent new plants from becoming established. In home landscapes, removing young plants by digging them out before they form rhizomes or set seed is the best strategy for control. Mature plants can also be dug out, but they sometimes grow back if rhizomes are left behind.In professionally managed turfgrass areas, prevention is an important component in managing this weed.

When dallisgrass is present in abundance or the plants are located over a large area, it may be necessary to supplement cultural practices with herbicides. PreventionDallisgrass is probably introduced into lawn areas with new turfgrass seed or with new sod. The seed can also be introduced on mowers that have been used in contaminated sites and then moved to weed-free sites.

Cleaning a mower after mowing a contaminated site should reduce the chance of invasion into new areas. Inspect sod before taking delivery to make sure dallisgrass is not present. Don’t use soil from dallisgrass-contaminated areas to repair low or bare spots in the turf.

In spring when new seedlings germinate, minimize the amount of aeration performed on the turfgrass to avoid small open areas where dallisgrass plants might become established. Cultural ControlBecause dallisgrass is a perennial plant, persistence is required to kill it with cultural practices.In lawn areas the clumps can be removed by digging. Mowing the turfgrass will not remove dallisgrass, but when turfgrass is mowed at its optimum height, it is better able to resist an invasion of dallisgrass.

Also, close mowing decreases shoot vigor and results in lower seed production. When dallisgrass has been established for some time in the turfgrass, seed will be abundantly present in the soil. In well-established turfgrass, seedlings may not be able to establish, but if there are open areas in the turf, seed will germinate in these areas.

If bare areas are present, overseed them with desirable turfgrass species to reestablish the turf. Dallisgrass is not normally a problem in ornamental areas, but if it does occur, the plants can be dug out and a mulch laid over the area to control the seedlings. Along roadsides and fences or in orchards and vineyards, the plants can be dug out during summer and left in place for the clumps of rhizomes to dry.

As long as all the rhizomes are dug up and dried, the plant will not regrow. New seed will germinate and establish unless they are removed when they are seedlings. Mulching with organic materials is not very effective for the control of mature dallisgrass.

However, if the tops of the plants are removed, laying black plastic or landscape fabric over the area will control the remainder of the plant as well as any new seedlings. Summer solarization will most likely control dallisgrass also. For information on solarization, see the publication Soil Solarization: A Nonpesticidal Method for Controlling Diseases, Nematodes, and Weeds listed in "References.

"Chemical ControlWhere digging out clumps of dallisgrass in turfgrass is not practical, herbicides may be used. Herbicides to control established plants are referred to as postemergent herbicides. These herbicides are either selective and kill only specific weeds, or they are nonselective and kill any plant they come in contact with.

To control germinating seed, preemergent herbicides are used. Established Plants in Turfgrass. The postemergent herbicides MSMA or CMA can be used to control clumps of dallisgrass growing in turfgrass.

These herbicides are relatively selective and must be applied two to three times at 3-week intervals in the summer. The turfgrass and dallisgrass should be in good growing condition before application. Also, it is best if the turf is left unmowed for 2 weeks before the first application to get the maximum amount of leaf area to spray the herbicide onto.

Withhold irrigation for 24 hours after application. Don’t apply these herbicides during hot weather and check the label for rate adjustments during warm weather to minimize the risk of injuring the turfgrass. Some turf managers have used the nonselective herbicide glyphosate (Roundup) to control dallisgrass in turf.

Glyphosate kills both the dallisgrass and the turfgrass, leaving an area of dead turf.To keep the turf vigorous and growing well enough to out-compete germinating dallisgrass seed, the spot needs to be overseeded. Sometimes the dallisgrass is not killed even though the turf is severely damaged or killed, thus requiring a re-treatment. Other nonselective postemergent herbicides are not as effective as glyphosate.

Seed in Turfgrass. Preemergent herbicides can be used in established turfgrass to control germinating dallisgrass seed. Apply preemergent herbicides in late winter or early spring before dallisgrass seed germinate.

Herbicides that control crabgrass such as bensulide, pendimethalin, oryzalin, DCPA, prodiamine, oxadiazon, or dithiopyr are also effective on dallisgrass. Ornamental and Noncrop Areas. In ornamental or noncrop areas, glyphosate can be used as a nonselective treatment to control established plants.

Apply glyphosate when dallisgrass is flowering but before seed have been produced. The preemergent herbicides napropamide, pendimethalin, oryzalin, or combinations of benefin plus oryzalin, or benefin plus trifluralin are effective on preventing dallisgrass seed from germinating. Once seedlings appear, then postemergent herbicides are necessary to control them chemically."

Sources: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7491.html .

Here are some resources that should help with the Dallisgrass Here is a link with some ideas-ipm.ucdavis.edu/PMG/PESTNOTES/pn7491.htmlIt can depend on what type of lawn it is in- Bermuda or St. Augustine-http://plantanswers.tamu.edu/turf/publications/weed14.htmlControl. In bermudagrass, dallisgrass is effectively controlled by two applications of MSMA or similar materials at 3 pounds per acre. Applications in early spring are most effective and should be repeated at 2-week intervals.

MSMA should be applied with a boom or broadcast sprayer in 100 gallons or less of water per acre. Make applications of MSMA 3 to 4 days after mowing to provide more leaf surface to absorb the herbicide. Do not water for at least 24 hours after treatment and delay mowing for several more days.

Dallisgrass leaves will begin to show discoloration 3 to 5 days after treatment and significant leaf burning should be apparent after 7 to 10 days. Within 2 weeks some regrowth may occur and a second application of MSMA is necessary. In St. Augustine and centipedegrass lawns, spot treatment of dallisgrass with glyphosate (Roundup) is most effective.

Treated areas need to be plugged or sodded with St. Augustine or centipedegrass after dallisgrass dies to prevent other weeds from becoming established in the dead areas. Preemerge herbicides may also be helpful in St. Augustine or centipede turf to prevent the spread of dallisgrass from seed. Some folks with the same issue discuss it here-http://www.dirtdoctor.com/forum/viewtopic.php?p=29125&sid=a8b1cab40840930521201c6a6927653aThank you for your question!

Sources: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7491.html .

Very basic, three pronged approach for a very detailed coverage:ipm.ucdavis.edu/PMG/PESTNOTES/pn7491.htm... on his recommendations for specific products:weedalert.com/weed_pages/wa_dallisgrass.... courses have this problem too! :cgcsa.org/default.aspx?id=328check your local home depot for products with MSMA, but here is one online:neeps.com/109620.html?productid=109620&c... wishes,Librarian50 Sources: walterreeves.com/qa_display.phtml?qaID=812 .

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