Dun I might be wrong on 2-4d have to back and check my book on restricted herbicides.
The secret of successful weed control in fields that have been planted to perennial grasses is timeliness. Most winter and summer annual broadleaf weeds can be controlled if the herbicides are applied when the weeds are less than 6 inches tall. If weeds are killed early, competition is reduced and the seeded grasses can make more rapid growth.
Ally can be applied at 0.1 oz/acre to the following grasses after the 3- to 4-leaf stage:
blackwell switchgrass; blue grama; big, little, plains, sand, ww spar bluestem; buffalograss; green sprangletop; Indiangrass; kleingrass; altherstone, sand, weeping, and Wilman lovegrass; sideoats grama; orchardgrass; Russian wildrye; and bluebunch, crested, intermediate, pubescent, Siberian, slender, streambank, tall, thickspike, and western wheatgrass. Do not use on soils with a pH greater than 8.0 or on legumes. Add a surfactant at 0.25% v/v. To improve the spectrum of weeds controlled add 2,4-D LVE at 0.25 pt/acre. Grasses must be in 5-leaf stage.
Some broadleaf weeds have become tolerant to Ally and other ALS herbicides. If Ally, Amber, Finesse, or Glean have been used in the past, ALS-resistant kochia or other broadleaf weeds may be present.
Amber at 0.28 to 0.56 oz/acre controls many broadleaf weeds. Use 60 days after emergence
of desirable grasses. The grasses should be in 3 to 4-leaf stage. If 2,4-D is added, wait until after grasses are in 5-leaf stage. The following grasses are listed on the label: bermudagrass, big bluestem, little bluestem, smooth brome, buffalograss, sheep fescue, blue grama, sideoats grama, redtop, timothy, and bluebunch, intermediate and pubescent wheatgrass. Do not use on grass/legume mixture. Add surfactant at 0.25% v/v. The possibility of ALS-resistant weeds exists.
Banvel plus 2,4-D amine is a good combination if 2,4-D tolerant weeds are present, such
as wild buckwheat, triazine-resistant kochia, or ALS-resistant weeds. Apply 0.5 pt/acre of Banvel plus 1 pt/acre of 2,4-D amine for cool-season grasses after the 5-leaf stage. Warm-season grasses are more prone to injury, so the use rate should be reduced to 0.25 pt/acre of Banvel plus 0.5 pt/acre of 2,4-D amine. Grass stands that are more than one year old may be treated with 0.5 to 1 pt/acre of Banvel plus 0.5 to 2 pt/acre of 2,4-D amine for perennial weed control. Banvel and 2,4-D will kill legumes in grass/legume seedings. Rates of 2,4-D are based on 4 lb ae/gal.
Buctril 2EC controls many broadleaf weeds and will not injure most grasses after the 3-leaf
stage. Buctril 2EC should be applied at 1.5 to 2.0 pt/acre in a minimum of 10 gal/acre of carrier by ground or 5 gal/ acre by air. This treatment may be applied to grass/alfalfa mixtures after the third trifoliate leaf stage of alfalfa, though temporary leaf burning may be noticeable after application. Buctril 2EC can be tank mixed with 2,4-D to improve broadleaf weed control, but grasses must be in the 5-leaf stage. However, this tank mix will kill or injure legumes in grass/legume mixtures.
Curtail is effective on many summer and winter annual weeds at 2 to 4 pt/acre. Curtail is
applied after perennial grasses have been established for one season and have tillered and developed a good secondary root system. The plants should be actively growing. During the second year, when perennial grasses have become more established, Curtail at 2 to 4 qt/acre can be used to aid in the control of Canada thistle. Musk thistle also can be controlled at 3 to 5 pt/acre.
2,4-D amine or ester will control most broadleaf weeds and will cause very little injury to most
grasses when applied after the 5-leaf stage. Use 1 pt/acre of amine and 1/2 pt/acre of Low Vol ester on cool-season grasses. Reduce the rate by one half to three fourths on warm-season grasses, which are less tolerant of 2,4-D. Legumes in grass/legume mixtures will be killed or injured with this treatment. Rates are based on 4 lb/gal acre of 2,4-D.
Escort is labeled for postemergence applications to crested wheatgrass and smooth brome at
0.25 to 1.0 oz/acre; and fescue and bluegrass at 0.25 to 0.5 oz/acre. Escort should be applied after the 3 to 4-leaf stage of the grasses. Add surfactant at 0.25% v/v.
Pursuit can be applied to legumes in 3-trifoliate growth stage and perennial grasses in 4-leaf
stage. Use 4 oz/acre on alfalfa, clover, crown vetch, birdsfoot trefoil, lespedeza, smooth brome, reed canarygrass, orchardgrass, big bluestem, little bluestem, switchgrass, Russian wildrye, and intermediate, crested, and tall wheatgrass. Use a non-ionic surfactant at 0.25% v/v with Pursuit.