GRASSES FOR SEED INTRODUCTION Pre-Crop: Begin to control weeds well before planting a grass seed crop. Pre-crop control is especially important for managing perennial weeds. Quackgrass, bermudagrass, Canada thistle, field bindweed, and other noxious perennials can be greatly reduced with properly timed applications of effective systemic herbicides. Some are most effective if applied in the early fall after harvest of the grass seed crop preceding corn. Others can actually be applied during the growing season of a previous crop. Be sure to consult labels for any recropping intervals required after a herbicide application. Consider spot treatments if perennial weed problems are not extensive enough to justify broadcast applications. In some instances, a fallow period may also be helpful in reducing weed populations. Stand Establishment: Site and species selection, seed quality, seedbed preparation, planting, irrigation, and fertilization each play an important role in getting a new stand of grass off to a good start. A healthy vigorous stand of grass can provide strong competition against many weeds. Be sure to do all you can to promote successful stand establishment. A publication of the Montana and Wyoming Agricultural Experiment Stations and the Soil Conservation Service entitled “Grass and legume seed production in Montana and Wyoming” (Special Report No. 12, 1986) is a useful guide to establishing and managing grass seed fields. Early removal of weeds is key to successful grass establishment. Control can be accomplished best through a combination of cultivation, mowing, hand roguing, and herbicides. Cultivate soon after grass rows become distinguishable, and as often as necessary to control weeds. Operate the equipment more slowly than when cultivating other row crops. Cultivate to a depth of 1 to 1.5 inches, and within 1 to 1.5 inches of the row. Buctril can be applied earlier to grass crops (1- to 2-leaf stage) than either Clarity or 2,4-D. Grasses should have at least 3 leaves before applying Clarity, or 5 leaves (6 to 8 weeks old) before applying 2,4-D. Mowing is sometimes necessary if weed growth becomes excessive. Cut weeds as low as possible without damaging young seedlings. Established Stands: Cultivation, hand roguing, and herbicides continue to be the key weed control tools in established grass seed fields. Cultivate as often as necessary to control weeds and volunteer grasses between rows. Cultivation deeper than 1.5 inches may damage grass roots, weakening the crop and making it more susceptible to weed invasion. Broadleaf weeds can be controlled selectively by dicamba, bromoxynil, clopyralid, or 2,4-D. Annual grassy weeds and volunteer grass crop seedlings can be controlled by Frontier applied prior to weed emergence. Be sure to follow label recommendations for rates and application timings. Application of some products at the wrong timing or at excessive rates could significantly reduce seed production or seed viability. Perennial broadleaf weeds and grasses can be controlled with spot applications of Roundup. No more than 10 percent of any field may be treated in this manner. Any desirable grasses contacted by Roundup may be killed. Hand roguing or hand weeding should be an integral aspect of every weed management program for established grass seed.
89
The information provided in this section is not intended to be a complete guide to herbicide use. Before using any herbicide product, thoroughly read the entire label and follow all label directions. Complete labels and MSDS information for the products listed in this section can be viewed on the web at: http://www.greenbook.net
Edited by: Dr. Steve Dewey Plants, Soils, Biometeorology Dept. Utah State University Logan, UT 84322 435-797-2256
90
Grass Weeds
Clarity
Frontier/Outlook
Gramoxone
Manage/Sempra
Paramount
Roundup
Scythe
Sencor
WEEDS LISTED ON GRASS SEED HERBICIDE LABELS
Annuals barnyardgrass bluegrass, annual brome, downy brome, ripgut brome, Japanese cheat crabgrass fescue, rattail foxtail, green foxtail, yellow goatgrass, jointed goosegrass grain (barley, wheat) grass (general) oats, wild rye, cereal ryegrass, annual sandbur stinkgrass witchgrass
P P P -
X X X X X X X X S X X X
X -
-
X X X X -
X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X -
Perennials barley, foxtail bentgrass bermudagrass bluegrass, bulbous bluegrass, perennial brome, smooth canarygrass fescue, tall grass (general) johnsongrass orchardgrass phragmites quackgrass ryegrass, perennial timothy wheatgrass, western nutsedge, yellow
-
X -
P -
X
-
X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X
X X X X X X
X = Listed on the label as “controlled,” S = Control seedling stage only, P = “Partially controlled” or “suppressed,” - = Weed is not listed on label.
91
Scythe
Sencor
Stinger/Lontrel
Surmount
Weedmaster
2,4-D
X P X X X X X -
Roundup
X X P X X P X X P X X X X X -
PastureGard
X P X X P X X P X X X X X X P X X X X -
Paramount
X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
MCPA
Curtail
X X X X X X X X X X X X X X X X X X X X X X X -
Gramoxone
Clarity
X X X X X X X X X X X X X X X X X X -
Frontier/Outlook
Buctril
Annuals bedstraw, common broadleaf (general) buckwheat, wild buffalobur catchfly, night flr. chamomile, corn chickweed, common clover, annual cockle, corn cockle, cow cocklebur, common dog fennel fiddleneck fleabane flixweed goosefoot, nettleleaf groundsel, common henbit jimsonweed knotweed, common kochia ladysthumb lambsquarters, common lettuce, prickly mallow, common mallow, Venice marestail (horseweed) marshelder mayweed morningglory, annual mustard, blue mustard, Jim Hill mustard, tansy mustard, wild nightshade, black nightshade, cutleaf nightshade, hairy pennycress, field pigweed, prostrate
Curtail M
Broadleaf Weeds
Bronate
WEEDS LISTED ON GRASS SEED HERBICIDE LABELS
X X X X
X -
X X X X X X X X
X X X X X -
X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X -
X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X X X X X X X X X X X X
X P X X X X P X X X X X X -
X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X X X
X X X X P X X X X X X X X X X
X = Listed on the label as “controlled,” S = Control seedling stage only, P = “Partially controlled” or “suppressed,” = Weed is not listed on label.
92
Broadleaf Weeds (continued)
Bronate
Buctril
Clarity
Curtail
Curtail M
Frontier/Outlook
Gramoxone
MCPA
Paramount
PastureGard
Roundup
Scythe
Sencor
Stinger/Lontrel
Surmount
Weedmaster
2,4-D
WEEDS LISTED ON GRASS SEED HERBICIDE LABELS
Annuals pigweed, redroot pigweed, tumble pineappleweed puncturevine purslane, common radish, wild ragweed, common ragweed, giant shepherds purse smartweed, Pennsylvania smartweed, green sorrel, red sowthistle, annual sowthistle, spiny spurge, prostrate spurry, corn sunflower, wild tarweed thistle, Russian velvetleaf wormwood, annual
X X X X X X X X X X X X X -
X X X X X X X X X X X X X -
X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X -
X X X X X X X X X X X X -
X X X X -
-
X X X X X X -
X X X X X -
X X X X X X X X X -
X X X X X X X X X X X -
X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X -
X X X P X X X -
X X X X X X X X X X X -
X X X X X X X X X X -
X X X X X X X X X X X X
Biennials burdock, common carrot, wild cockle, white evening primrose gromwell, corn knapweed, diffuse mallow, dwarf salsify (goatsbeard) starthistle, yellow sweet clover teasel thistle, bull thistle, musk thistle, plumeless
X -
-
X X X X X X X X X X X X X X
X X X X X X -
X X X X X X X -
-
-
X X -
-
X X X -
-
-
X X -
X X X X X X -
X X X
X X X X -
X X X X X X X -
X = Listed on the label as “controlled,” S = Control seedling stage only, P = “Partially controlled” or “suppressed,” - = Weed is not listed on label.
93
Broadleaf Weeds (continued)
Bronate
Buctril
Clarity
Curtail
Curtail M
Frontier/Outlook
Gramoxone
MCPA
Paramount
PastureGard
Roundup
Scythe
Sencor
Stinger/Lontrel
Surmount
Weedmaster
2,4-D
WEEDS LISTED ON GRASS SEED HERBICIDE LABELS
Perennials alfalfa artichoke, Jerusalem aster, spp. bindweed, field broadleaf (general) bursage buttercup, tall campion, bladder chickweed, mouse-ear chicory clover daisy, oxeye dandelion, common dock, curly dogbane, hemp goldenrod hoary cress (whitetop) knapweed, Russian knapweed, spotted milkweed, common milkweed, whorled mullein, common nightshade, silverleaf onion, wild plantain, broadleaf povertyweed ragweed, western sowthistle, perennial spurge, leafy thistle, Canada toadflax, dalmatian vetch woodsorrel wormwood yarrow, common
X X -
-
X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X P X X P X X -
X X X X X P X X P X X -
-
P -
X X -
X X X X X -
X X X X X X X X X X X -
X X X X X X X X X X X X X X X X X X -
X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X -
X X X X X X P P X X -
X X X X X X X X X X
X X X X X X X X X X X X X X X -
P X P X X P P P P P X P X -
X = Listed on the label as “controlled,” S = Control seedling stage only, P = “Partially controlled” or “suppressed,” - = Weed is not listed on label. Not all weeds listed on herbicide labels apply to all crops or sites found on that label. Weeds in this table are taken from the overall list of controlled weeds found on each respective label, but may not all be controlled at the rates and/or timings required for the specific use category of GRASSES GROWN FOR SEED. Level of control considered “acceptable” for inclusion of a weed on labels may vary between herbicide manufacturers. Absence of a weed from a label does not necessarily mean complete lack of control. High level rates may be necessary to achieve level of control claimed for some weeds.
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GRASS SEED Herbicide 2,4-D (4 L) (numerous brands)
Application and Remarks Rate:
0.75 to 1 pt/A (4 L) on seedling grass, and 1 to 4 pt/A (4 L) on established grass
Time:
Apply to seedling grasses after the 5-leaf stage. Apply to well established grasses in spring after tillering, but before the early boot stage; or apply after the milk stage.
Remarks:
For control of annual and perennial broadleaf weeds in grasses grown for seed. Perennial weed regrowth may be treated in the fall. Rates and timing information for grass seed crops vary between brands and formulations of 2,4-D. Some brands are labeled for turfgrass varieties only.
Caution:
Do not apply more than two broadcast treatments per year. Do not use on bentgrass unless grass injury can be tolerated. Do no graze lactating dairy animals on treated grass for at least 7 days after application. Do not harvest treated grass for hay within 30 days after application. Withdraw meat animals from treated area at least 3 days before slaughter.
Numerous formulations of 2,4-D are labeled for use on grasses grown for seed including Barrage HF, Esteron 99, Formula 40, Hardball, Opti-Amine, RT Master, Turret, Unison, Weedar, and Weedone. Application rates, timing, and other label instructions for these and other labeled products may differ from those stated above. Bronate (4 EC) MCPA + bromoxynil
Rate:
1 to 2 pt/A (4 EC)
Time:
Apply to established and newly seeded grasses grown for seed before the boot stage. Optimum control is obtained when applied to small actively growing weeds.
Remarks:
For control of annual broadleaf weeds in grasses grown for seed. Tolerant established grasses include bentgrass, Kentucky bluegrass, fescue, ryegrass, and bermudagrass. Tolerant seedling grasses include certain cultivars or varieties of Kentucky bluegrass, fescue, orchardgrass, bentgrasses and perennial ryegrass. May be applied by ground, air, or through sprinkler irrigation systems.
Caution:
Do not allow livestock to graze in treated areas. Do not feed treated grasses to livestock.
Additional pre-mix formulations of MCPA + bromoxynil are labeled for use on grasses grown for seed, including Bromox-MCPA, Maestro MA, and Wildcard Xtra. Application rates and other label instructions for these products may differ from those stated above. Buctril (2EC, 4EC) bromoxynil
Rate:
1 to 2 pts 2EC, or 0.5 to 1 pt 4EC product/A
Time:
Apply to newly seeded or established grasses before the boot stage. Apply before broadleaf weed seedlings exceed the 4-leaf stage, 2inch height, or 1-inch diameter.
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GRASS SEED - continued Herbicide
Clarity (2L) dicamba
Application and Remarks Remarks:
For control of many annual broadleaf weeds and suppression of Canada thistle in perennial grasses grown for seed. Tolerant established grasses include bentgrasses, Kentucky bluegrass, fescues, ryegrass, and bermudagrass. Tolerant seedling grasses include cultivars of Kentucky bluegrass, fescue, orchardgrass, bentgrass, perennial ryegrass, or forage grasses (planted for seed production only). May be applied by ground, air, or through sprinkler irrigation systems.
Caution:
Leaf burn may occur when applied with liquid fertilizer.
Rate:
0.5 to 1 pt/A (2 L) on seedling grass, or up to 2 pt/A (2 L) on wellestablished grass.
Time:
Apply after seedling grasses reach at least the 3- to5-leaf stage. Apply to established grasses before crop begins to joint. Apply when weeds are in the 2- to 4-leaf stage and rosettes are less than 2 inches across.
Remarks:
For broadleaf weed control in bermudagrass, bluegrass, and lawntype fescue and ryegrass crops grown for seed. Clarity may also be applied through wiper application equipment using a solution of 1 part Clarity to 1 part water. For suppression of downy brome, ripgut brome, or rattail fescue apply 2 quarts of Clarity per treated acre in the fall or late summer after harvest and burning of established grass seed crops. Application should be made immediately following the first irrigation before annual grasses have more than 2 leaves. Injury to new seedlings may occur if intervals between preplant application and grass planting is less than 45 days per pint/A of Clarity. Grass crops should not be planted into areas treated with 2 qts/A or more until 1 year after application.
Caution:
Avoid disturbing treated areas for at least 7 days following application. Do not use on bentgrass unless possible crop injury can be tolerated.
Additional formulations of dicamba may be labeled for use on grasses grown for seed, including Banvel (Micro Flo) and Diablo (NuFarm T&S). Application rates and other label instructions for these products may differ from those stated above. Curtail (2.38 EC) clopyralid + 2,4-D
Rate:
2 to 4 pts/A (2.38 EC)
Time:
Apply to well established grass prior to the boot stage. Weeds should be actively growing.
Remarks:
For control of many annual broadleaf weeds, Canada thistle, and Russian knapweed in established grasses grown for seed. 1.75 pts Curtail/A may be tank mixed with Clarity or Buctril. For control of lateemerging Canada thistle, a preharvest treatment may be made after grass seed is fully developed. Postharvest fall treatments may be made to actively growing Canada thistle.
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GRASS SEED - continued Herbicide
Application and Remarks Curtail M is a related formulation that combines clopyralid with MCPA rather than 2,4-D. It, too, is labeled for control of weeds in grasses grown for seed. Instructions for application timing, rate, and/or the species of weeds controlled may differ slightly compared to the Curtail label.
Frontier (6 EC) Outlook (6 EC) dimethenamid
Gramoxone Max (3 L) Gramoxone Super Tres paraquat
Caution:
Re-treat as necessary, but do not exceed 4 pts product/A per season. The potential exists for some crop injury. Do not use on bentgrass unless injury can be tolerated. Do not plant grasses within 30 days after an application of Curtail.
Rate:
14 to 21 oz product/A (6 EC)
Time:
Apply in the fall prior to emergence of targeted weeds, or in a sequential use program with other herbicides that control emerged weeds. Grass seed crop must have been established for at least 1 year or had at least one seed crop harvested before application.
Remarks:
For use in established stands of bentgrass, Kentucky bluegrass, fine fescue, tall fescue, orchardgrass, and perennial ryegrass. Provides preemergence control or suppression of volunteer seedlings from grass seed crops, and control or suppression of annual bluegrass, downy brome, Italian ryegrass, rattail fescue, and certain other weedy annual grasses. Grass straw from the previous harvest must be removed, burned, or evenly spread prior to application; and the herbicide must be moved into the upper soil surface by rainfall or sprinkler irrigation before weed emergence, or reduced weed control may result.
Caution:
Do not apply in tank mixtures with other herbicides. Do not apply more than 21 oz product/A per season. Do not allow livestock to graze in treated fields. Do not feed treated grasses, forage, hay silage, straw, seed, or seed screenings to livestock.
Rate:
1.3 to 2.7 pts/A (3 L)
Time:
Apply preplant, at planting, or preemergence when weeds are in the 3to 5-leaf stage.
Remarks:
For use in seedbed preparation prior to planting grasses grown for seed. Controls many annual grasses and broadleaf weeds. Prepare seedbed and allow weeds to germinate. Repeat applications as necessary prior to or on the day of seeding. Always add a nonionic surfactant at the rate of 1-2 pints per 100 gallons of spray. Weeds emerging after application will not be controlled. Drought stressed or dustcovered weeds will not be controlled effectively.
Caution:
RESTRICTED-USE HERBICIDE. Read and follow all instructions and precautions on the label. Do not graze treated areas or use the seed or straw from treated areas for animal feed or bedding.
97
GRASS SEED - continued Herbicide Manage (75 WDG) Sempra halosulfuron
MCPA (4 L) (various brands)
Application and Remarks Rate:
0.67 to 1.33 oz/A (75 WDG)
Time:
Apply to established grass after nutsedge has reached the 3- to 8-leaf stage of growth. A second treatment may be required 6 to 10 weeks later.
Remarks:
A selective postemergence treatment for control of yellow nutsedge in sod or turf grasses grown for seed. Tolerant grasses include established creeping bentgrass, Kentucky bluegrass, perennial ryegrass, fine fescue, tall fescue, and bermudagrass. Use 0.25 to 0.5 percent v/ v of a nonionic surfactant for broadcast applications.
Caution:
No more than four applications can be made with the total use rate not exceeding 5.33 oz/A per season.
Rate:
2 to 4 pt/A (4 L)
Time:
Apply in the spring to established grasses before head comes into boot stage and on seedling grass after grass has tillered.
Remarks:
For control of many annual broadleaf weeds. Apply in 2 to 120 gallons of water by air or ground sprayer application. Use higher rate where weed stands are heavy. Repeat treatment may be needed for less susceptible weeds. White clover and other legumes may be temporarily injured or killed.
Caution:
In some areas bentgrass, buffalograss, carpetgrass, centipede grass, dichondra, and St. Augustine grasses may be injured.
Several formulations of MCPA are labeled for use on grasses grown for seed including Dagger, MCPA-LV4 Ester, MCPA-4 Amine, Rhomene, and Rhonox. Application rates, timing, and other label instructions for these and other labeled products may differ from those stated above. Paramount (75 WDG) quinclorac
Rate:
5.3 oz/A (75 WDG)
Time:
Apply when annual weeds are small and actively growing. For bindweed control apply after grass seed harvest and hay removal, but before the first killing frost.
Remarks:
For control of annual grasses, broadleaf weeds, and field bindweed in the following grasses grown for seed: bromegrass (smooth and meadow), fescue (tall and fine), Kentucky bluegrass, needlegrass, orchardgrass, wheatgrasses, wildrye, bermudagrass, blue grama, and switchgrass. Use of a spray additive is required. Methylated seed oil is recommended, but crop oil concentrate is permitted.
Caution:
Paramount is rain-fast 6 hours after application. Do not apply to weeds under drought stress. Do not plant any crop other than wheat or grain sorghum for 10 months following application. Do not apply more than 16 oz/A per year. Do not feed treated grasses, seed, or seed screenings to livestock. Do not allow livestock to graze treated areas.
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GRASS SEED - continued Herbicide PastureGard (2 EC) triclopyr + fluroxypyr
Roundup Original (4 L) glyphosate
Scythe (4.2 EC) pelargonic acid and related fatty acids
Application and Remarks Rate:
1.5 to 8 pts/A (2 EC)
Time:
Do not apply until grass seedlings are well established as indicated by tillering (usually after 4 true leaves have emerged), development of a secondary root system, and vigorous growth. Do not apply to established grasses from early boot to milk stage. Apply when weeds are small and growing actively before the bud stage.
Remarks:
For control of herbaceous broadleaf weeds and woody plants in established range and pasture grasses grown for seed. May be applied by air or ground equipment. A nonionic surfactant may improve weed control, especially if plants are drought stressed.
Caution:
Do not apply more than 4 qts/A per annual growing season. Do not use on bentgrass unless injury can be tolerated. Do not reseed treated areas for a minimum of 3 weeks after treatment. Do not allow grazing or harvest of green forage for lactating dairy animals during the same growing season following application.
Rate:
0.5 to 3 qts/A (4 L)
Time:
Can be used for the following types of applications: preplant, preemergence, at-planting, renovation, site preparation, shielded sprayers, wiper applications, and spot treatments.
Remarks:
Controls most existing vegetation prior to seeding or renovating turf or forage grass seed production areas. Apply to actively growing weeds at growth stages indicated on label. Rates depend on weed species. Do not disturb underground plant parts before treatment. Delay tillage or renovation techniques for at least 7 days after application to allow herbicide translocation into underground plant parts. For spot treatments use a 1.0 to 2.0 percent solution applied prior to heading of grasses.
Caution:
Broadcast applications must be made prior to crop emergence to avoid injury. Avoid treatment if rainfall is expected within 6 hours. If application rate is 3 qts/A or less, no waiting period between treatment and livestock feeding or grazing is required. Other formulations of Roundup, as well as numerous other brands of glyphosate are labeled for use in grass seed production. Examples include Accord, Credit, Glyfos, Glyphomax, Glyphosate, Glypro, Honcho, Prosecutor, Ranger, Rattler, Razor, RT Master II, and Touchdown. Application ratesa n d other label instructions for these products may differ from those stated above.
Rate:
3 to 10 percent by volume (3 to 10 gallons of Scythe per 100 gallons of total spray solution)
Time:
Apply to small emerged weeds prior to crop emergence or after harvest.
99
GRASS SEED - continued Herbicide
Sencor (75 DF) metribuzin
Stinger (3 EC) Lontrel (3 EC) clopyralid
Application and Remarks Remarks:
For nonselective control of annual weeds and suppression of perennial herbaceous weeds in pasture grasses or turf grasses grown for seed produciton. Apply in water as a broadcast spray in 70 to 200 gallons of spray solution per acre. Continuous agitation is required. A defoaming agent may be added to prevent excessive foaming. Thorough spray coverage is required for best results. Repeated applications may be required for control of perennial weeds.
Caution:
Do not apply after crop has emerged. Do not allow spray to come in contact with the foliage of other desirable plants. Do not apply through any type of irrigation system. Do not apply by aircraft.
Rate:
0.5 lb/A (75 W)
Time:
Apply when crop is dormant and prior to active spring growth.
Remarks:
Wyoming and Montana only (SLN #’s. WY-010001, MT-950007). To reduce competition from downy brome in established perennial grasses (wildrye, meadow brome, or wheatgrass) grown for seed. Established grasses are those which have been harvested at least once for seed, or were planted 1 year or more prior to application. Weed control may be enhanced by adding wetting agents containing crop oil. Follow the directions for use and rates recommended on the wetting agent label.
Caution:
Do not apply more than once per year. Application on sandy soils or soils with a pH greater than 8 may result in unacceptable crop injury. Do not apply through irrigation systems. Crop and crop residues may be fed to livestock or used as bedding. If the seed crop is terminated and grazed or cut for forage, allow at least 28 days between application and use as animal feed. SLN label must be in the possession of user at time of application.
Rate:
0.25 to 0.67 pt/A (3 EC)
Time:
Apply to well established grass prior to the boot stage. Weeds should be actively growing. Treatment of Canada thistle at the bud stage or later may result in less consistent control.
Remarks:
For control of many annual broadleaf weeds and Canada thistle in established grasses grown for seed. Re-treat as necessary, but do not exceed 0.67 pt product/A per season. For control of late-emerging Canada thistle, a preharvest treatment may be made after grass seed is fully developed. Postharvest fall treatments may be made to actively growing Canada thistle. Stinger may be tank mixed with dicamba, bromoxynil, 2,4-D, or MCPA.
Caution:
Do not apply to bentgrass unless crop injury can be tolerated. Do not tank mix Stinger with 2,4-D, dicamba, or MCPA unless some crop injury is acceptable.
100
GRASS SEED - continued Herbicide Surmount (2.15 EC) picloram + fluroxypyr
Application and Remarks Rate:
1.5 to 2.5 pts/A (2.15 EC) for broadleaf weeds, and 3 to 6 pts/A for control of woody species.
Time:
Apply preplant or postemergence. For best results apply when weedsare small and actively growing, but before bud stage of growth. When applying preplant, do not seed for a minimum of 3 weeks after application. For seedling grasses, do not apply until tillering (usually after 4 true leaves have emerged), development of a secondary root system, and vigorous growth. For established grasses grown for seed production, do not use from early boot to milk stage.
Weedmaster (4 L) dicamba + 2,4-D
Remarks:
For the control of annual and perennial broadleaf weeds and woody species in range and pasture grasses grown for seed.
Caution:
RESTRICTED-USE HERBICIDE. Do not apply more than 3 qts/A per season. Do not allow lactating dairy animals to graze treated areas and do not harvest forage for consumption by lactating dairy animals within 14 days after application.
Rate:
0.5 to 4 pts/A (4 L)
Time:
For new seedings, apply at the germinating stage of weeds. Under favorable conditions, this is usually 7-10 days after planting grasses. Reduced control can be expected if weeds are allowed to reach 1 inch in height. For established grasses grown for seed, do not apply after grass reaches the joint stage.
Remarks:
For control of broadleaf weeds in range and pasture grasses grown for seed. To improve control of emerged weeds, surfactants and/or crop oil concentrate may be used. Re-treatments may be needed for some species; however, do not exceed a total of 8 pts/A per growing season.
Caution:
Newly seeded areas may be injured if rates greater than 2 pts/A are applied. Do not use on bentgrass, buffalograss or St. Augustine grass.
Other formulations of dicamba + 2,4-D are labeled for use on grasses grown for seed including KambaMaster, and Banvel+2,4-D. Application rates, timing, and other label instructions for these and other similar labeled products may differ from those stated above.
101
