GRASS ROADSIDE VEGETATION MANAGEMENT

Transcription

1 Patrick E. McCullough, Extension Agronomist Weed Science In ptions of the United States, numerous weed species have developed resistance members of the sulfonylurea herbicide family (e.g. Telar, Oust, Esct). Sulfonylurea resistant biotypes are able survive use rates several times higher than needed control susceptible biotypes. Roadside managers are encouraged adhere the following weed control practices prevent the occurrence of sulfonylurea resistant weeds. 1. Tank mix sulfonylurea herbicides with herbicides that have a different mode-of-action (e.g.,,-d, etc.).. Do not let weed escapes go seed in areas that were treated with sulfonylurea herbicide. 3. Respray problem areas with an herbicide that has a different mode-of-action than a sulfonylurea.. Rotate the use of sulfonylurea herbicides with herbicides that have a different mode-of-action. These dmant treatments are designed f roadsides having predominantly bermudagrass. Annual Grass and Broadleaf Weed Suppression in Dmant 1 oz 0.75 oz H Oust may be applied once in Novemberearly-February while the bermudagrass is dmant f the control of winter annual grass and broadleaf weeds. This treatment may delay greenup of the bermudagrass lb H Glyphosate may be applied in Decembermid-March while the bermudagrass is dmant f the control of winter annual grass and broadleaf weeds. This treatment does not provide residual control. Oust 75 DG Journey lb/gal,-d amine Campaign 3.1 lb/gal 0.5 oz 0.5 lb 0.1 oz H Apply in Decembermid-March while the bermudagrass is dmant f the control of winter annual grass and broadleaf weeds. greenup is not delayed extensively with this treatment. 0.5 oz 0.5 oz 0.5 lb 0.1 oz 0.1 oz H Glyphosate Oust Telar may be applied in Decembermid-March while the bermudagrass is dmant f the control of winter annual grasses and broadleaf weeds. greenup is not extensively delayed by this treatment. 16 fl oz H Apply dmant bermudagrass f the control of annual broadleaf weeds. Add a nonionic surfactant at 0.5% v/v the spray mix. DO NOT apply immediately befe during spring green-up of bermudagrass significant delays in greenup will occur. 1- qt lb Campaign may be applied once f the control of winter annual grass and broadleaf weeds befe bermuda greenup. It may also suppress control broadleaf weeds lerant of these other treatments. Refer the label f rates f particular species. It is not necessary add a surfactant Campaign. Since Campaign is a fmulation containing,-d, use special precautions when applying in the vicinity of,-d sensitive crops such as vegetables, bacco, fruit trees, namentals and cotn. Overdrive 76.% DF 0. lb ai 0.5 lb ai/lb 1-8 oz H Controls annual and perennial broadleaf weeds. Add a nonionic surfactant at 0.5% v/v methylated seed oil at pt/a the spray mix. Diflufenzopyr has been shown improve the activity of auxin-like herbicides such as triclopyr, clopyralid and piclam. May be tank-mixed with Garlon and 3A,,-D, Plateau,, Esct, Oust, Telar and M SMA increase spectrum of weed species controlled. Overdrive is rainfast within hours after application. 16 UGA Extension Special Bulletin 8 Gegia Pest Management Handbook 018 Commercial Edition

2 Maintenance of Actively Growing (Weed Control MSMA (Several trade names) 6 lb/gal DSMA (Several trade names) 3.6 lbs/gal Overdrive 76.% DF 0. lb 0.5 lb/lb Plateau Impose.0 lb/gal Journey lb/gal nicosulfuron Pasra 56% 15% /3 gal 1 gal GRASS ROADSIDE VEGETATION MANAGEMENT lb 3.6 lb -8 oz H May be applied during summer months every -6 weeks f suppression control of emerged weeds. This treatment will release actively growing bermudagrass and suppress bahiagrass, dallisgrass, johnsongrass, and several broadleaf weeds. 1 H Controls annual and perennial broadleaf weeds. Add a nonionic surfactant at 0.5% v/v methylated seed oil at pt/a the spray mix. Diflufenzopyr has been shown improve the activity of auxin-like herbicides such as triclopyr, clopyralid and piclam. May be tankmixed with Garlon and 3A,,-D, Plateau,, Esct, Oust, Telar and M SMA increase spectrum of weed species controlled. Overdrive is rainfast within hours after application lb H May be applied during summer months suppress control emerged weeds and release well-established and actively growing bermudagrass. F bahiagrass growth and seedhead suppression apply a second application at 0.15 lb ai/a 6-8 weeks after the initial application. 3- fl oz H Apply after full spring green-up of bermudagrass during the summer months suppress bahiagrass growth and seedhead development. Add a nonionic surfactant at 0.5% v/v methylated seed oil at 1.5- pt/a the spray mix. Do not apply immediately befe during bermudagrass green-up. A second treatment may be applied in 6-10 weeks f continued growth suppression oz H Oust may be applied after full spring green-up of bermudagrass suppress bahiagrass growth 0.5 oz and seedhead development and f the control of certain broadleaf weeds. A second treatment may be applied 6-10 weeks later f continued suppression. Be certain that no bermudagrass injury is present befe making the second application. A nonionic surfactant at 0.5% v/v should be added the spray mix. 0.5 oz 0.1 lb 0.1 oz 8-16 fl oz oz H Glyphosate Oust may be applied bermudagrass provide bahiagrass seedhead inhibition and vegetative suppression. Apply 1- weeks after full greenup of bermudagrass and bahiagrass after the bahiagrass has been mowed. Application should be made pri seedhead emergence. 1 H Apply actively growing bermudagrass f the control of annual broadleaf weeds, certain annual and perennial grasses and various sedges. Add a nonionic surfactant at 0.5% v/v the spray mix. H Use f control of grassy and broadleaf weeds in bermudagrass on uncultivated nonagricultural areas (such as airpts, highway, railroad, and utility rights-of-way, sewage disposal areas, etc.); uncultivated agricultural areas (such as farmyards, fuel srage areas, fence rows, soil bank land, barrier strips, etc.); and, industrial sites (such as lumberyards, pipelines, tank farms, etc.) including grazed areas on all these sites. Apply with a nonionic surfactant, crop oil concentrate, ammonium nitrogen fertilizer. UGA Extension Special Bulletin 8 Gegia Pest Management Handbook 018 Commercial Edition 17

3 Maintenance of Actively Growing (Weed Control aminopyralid Milesne VM lb/gal -7 fl oz H Controls numerous broadleaf weed species such as hseweed, dogfennel, hsenettle and tropical soda apple. Milesne is non-volatile, but use care when applying in the vicinity of broadleaf crops, fruit trees, and namentals. Milesne can be tank-mixed with Plateau,, MSM A,,-D and numerous other herbicides labeled f use on grass roadsides. Add a nonionic surfactant at 0.5% v/v the spray mix. aminocyclopyrachl Streamline 5DF 3.5% 1.6% oz Apply f weed and brush control on non-crop areas, rights of ways industrial sites and natural areas such as campgrounds. Apply early postemergence treatments when broadleaf weeds are actively germinating growing. The length of control is dependent on the application rate, condition and growth stage of target weeds, environmental conditions at and following application, and the density and vig of competing desirable vegetation. Applications bermudagrass, Kentucky bluegrass and tall fescue industrial and roadside turfgrasses can cause transient stunting, yellowing and/ seedhead suppression. To reduce these transient sympms, make application later in the spring after new growth is -6 tall make application in the fall. Do not apply me than 11.5 oz broadcast/a/year. aminocyclopyrachl Perspective 55DF % oz ( ) Controls broadleaf and grassy weeds in non-crop areas, rights of ways at industrial sites and natural areas such as campgrounds. Applications bermudagrass, Kentucky bluegrass and tall fescue industrial and roadside turfgrasses can cause transient stunting, yellowing and/ seedhead suppression. To reduce these transient sympms, make application later in the spring after new growth is -6 tall make application in the fall. Do not apply me than 11.5 oz broadcast/a/year. Do not apply me than 11 oz/broadcast/a/year as a result of broadcast, spot repeat applications. Do not apply me than 3 times per year.,-d Campaign 3.1 lb/gal qt lb Campaign may be applied actively growing well-established bermudagrass and bahiagrass suppress control emerged weeds and allow the release of the bermudagrass. Use the low rate on bahiagrass. This treatment will control many broadleaf weeds lerant of MSMA, DSMA, Roundup Pro, Roundup Pro Oust due the,-d which is one of the ingredients. Rate of application should be based on the weed species most common on the roadside (Refer label). It is not necessary add a surfactant Campaign. Since Campaign is a fmulation containing,-d, use care when applying in the vicinity of,-d sensitive crops such as vegetables, cotn, bacco, fruit trees, and namentals. sulfosulfuron OutRider 75DF 1.33 oz H Recommended f the control of emerged johnsongrass and sedges in bermudagrass and bahiagrass. DO NOT use OutRider on other grass species such as tall fescue. OutRider does not control annual grasses such as crabgrass and sandbur, perennial grasses such as dallisgrass and vaseygrass. Apply johnsongrass at a minimum of 18 tall up the heading stage. Apply sedges 6-10 tall. Add a nonionic surfactant at 0.5% v/v. OutRider may be tank-mixed with other herbicides; however, amine fmulations may reduce johnsongrass control. F best results, do not mow f two weeks befe after application. 18 UGA Extension Special Bulletin 8 Gegia Pest Management Handbook 018 Commercial Edition

4 Maintenance of Actively Growing (Weed Control 1 H Cleantraxx provides pre and postemergence control of susceptible weeds in roadsides, railroads, industrial sites, and other non-crop areas. The best weed control is obtained by applications weeds either preemergence at early postemergence timings. F the best control of emerged grass and broadleaf weeds, apply a tank mix of Cleantraxx with a postemergence herbicide registered f use on the specific site. F postemergence applications, Cleantraxx must be applied with an approved adjuvant. Do not apply me than.5 pt/a/year. Do not apply Cleantraxx when weather conditions fav drift. Do not treat inside banks botms of irrigation ditches, either dry containing water, other channels that carry water that may be used f irrigation domestic purposes. A single rainfall of 0.5 me, within 1 days after application, is necessary activate treatments f preemergence control. penoxsulam oxyflufen Cleantraxx lb/gal 3-.5 pt famsulfuron iodosulfuron-methyl thiencarbazonemethyl Derigo WDG. 10% 3-6 oz lb Apply 3-6 oz/a f grassy and broadleaf weed control. Do not exceed the maximum amount of 6 oz/a/year as a broadcast spray of this product. F broadcast applications, use a minimum of 10 gal water/a. F weed control in dense weed populations, control of weeds under adverse growing conditions, control of mature weeds, spray volume should be increased obtain adequate spray coverage of targeted weeds. Do not use this product on cool-season grass types, including tall fescue, fine fescue, Kentucky bluegrass, perennial ryegrass unless control of these species is desired. Rainfall within hours of spray drying may result in reduced weed control and may necessitate retreatment. Do not mow immediately after application befe spray has dried weed control may be reduced. After treatment, do not transfer clippings non-target areas. F johnsongrass, dallisgrass, and vaseygrass control, apply in combination with MSO at 0.5-1% v/v and apply as a broadcast, spot application, directed spray. Make a second application if regrowth is observed days later. Application should be made in the fall f optimum control of dallisgrass. Tall Fescue Seedhead Suppression and/ Weed Control MSMA (Several trade names) DSMA (Several trade names) 1/3 gal 1 gal 0.5 oz lb 3.6 lb lb 0.1 oz 1 H Mow roadsides, if needed, when bahiagrass dallisgrass seedheads begin appear (usually in early June). Begin treatment when grasses begin send up new seedheads. Air temperature in afternoons should be 80 F above. Apply as needed when new seedheads other weeds emerge usually at -6 week intervals. During the summer, -3 applications will be needed. This treatment suppresses bahiagrass, dallisgrass, johnsongrass and broadleaf weeds and allows fescue remain with little injury. H Glyphosate Oust may be applied tall fescue roadsides suppress tall fescue seedhead production, broadleaf weeds and grasses. Apply established, actively growing tall fescue in the spring pri seedhead emergence (usually between March 1-April 1). Slight discolation of the fescue may occur. sethoxydim Sethoxydim G-Pro 1 lb/gal 1 1 lb/gal 0.1 lb 1 H May be applied tall fescue roadsides suppress tall fescue seedhead production. Apply established tall fescue that is actively growing in the spring pri seedhead emergence (usually between March 1-April 1). Do not apply fescue less than 1 year old. Apply in 30-0 gal of water/a. Sethoxydim will not suppress control broadleaf plants which may be released due the suppression of tall fescue. Discolation of the fescue will often occur and may sometimes be severe. UGA Extension Special Bulletin 8 Gegia Pest Management Handbook 018 Commercial Edition 1

5 Tall Fescue Seedhead Suppression and/ Weed Control 0.5 oz 0.1 oz H Telar may be applied suppress tall fescue seedhead production. Apply established tall fescue that is actively growing in the spring pri seedhead emergence (usually between March 1 and April 1). Some suppression of the grass growth may occur. This treatment will also help suppress control many broadleaf weeds. 0.5 oz oz H Glyphosate Telar may be applied tall fescue suppress seedhead production and control some annual weeds. Apply established tall fescue in the spring pri seedhead emergence (usually between March 1 and April 1). Make only one application per season. Telar provides better control of thistles and mustards than Oust. Esct, Patriot 60 DG 0.5 oz oz H Glyphosate may be applied tall fescue suppress seedhead production and control some annual weeds. Apply established tall fescue in the spring pri seedhead emergence (usually between March 1 and April 1). Overdrive 76.% DF 0. lb 0.5 lb/lb 1-8 oz H Controls annual and perennial broadleaf weeds. Add a nonionic surfactant at 0.5% v/v methylated seed oil at pt/a the spray mix. Diflufenzopyr has been shown improve the activity of auxin-like herbicides such as triclopyr, clopyralid and piclam. May be tank-mixed with Garlon and 3A,,-D, Plateau,, Esct, Oust, Telar and MSMA increase spectrum of weed species controlled. Overdrive is rainfast within hours of application. aminopyralid Milesne VM lb/gal -7 fl oz H Controls numerous broadleaf weed species including hseweed, dogfennel, hsenettle and tropical soda apple. Milesne is non-volatile, but use care when applying in the vicinity of broadleaf crops, fruit trees, and namentals. Milesne can be tank-mixed with Plateau,, MSMA,,-D and numerous other herbicides labeled f use on grass roadsides. Add a nonionic surfactant at 0.5% v/v the spray mix. Plateau Impose lb/gal -3 fl oz H Apply in early spring suppress tall fescue foliar growth and seedhead emergence. 150 UGA Extension Special Bulletin 8 Gegia Pest Management Handbook 018 Commercial Edition