| Weed Problem | Cropa | Chemical rate per acre | Product per acre | Remarks |
|---|---|---|---|---|
| Cover crops, including perennial sods, annual weeds and top kill, and suppression of perennial weeds | G,F | Paraquat 0.5-1.0 lb
+ surfactant |
Gramoxone Inteon 2.0-4.0 pt
+ surfactant as labeled |
Use 2.0-2.5 pints per acre for weeds 1 to 3 inches, use 2.5-3.0 pints per acre for weeds 3 to 6 inches, and use 3.0 to 4.0 pints per acre for weeds over 6 inches. Weeds 6 inches or taller may not be controlled. Always use a nonionic surfactant. Uniform coverage is important for good kill. Use lower rates for rye cover crop. Must be accompanied by preemergence residual herbicides. |
| Annual weeds, cover crops, perennial sods and suppression of perennial weeds, such as quackgrass and thistle (Canada) | G,F | Glyphosate 0.5-5.0 lb | Roundup Weather Max 0.5-3.1 qt
or Touchdown Total 0.35-3.5 qt or other labeled glyphosate formulation |
Apply before crop emergence. Use 1.0 to 1.5 pounds for control of annual cover crops and emerged annual grass and broadleaf weeds. Use 2.0 to 3.0 pounds for emerged perennial weeds. At normal application dates in no-till systems, perennial weeds may not be at the proper stage of growth for control. Since glyphosate is slower acting than paraquat in killing vegetation, its use may result in greater soil moisture loss. Uniform coverage is important. Rainfall within 1 hour may reduce effectiveness. This chemical must be accompanied by residual herbicides for season-long grass and broadleaf weed control. Touchdown Total is available in a non-surfactant containing formulation called Touchdown HiTech. |
a - G=grain sorghum; F=forage sorghum
