| Weed Problem | Stage | Chemical rate per acre | Product per acre | Remarks |
|---|---|---|---|---|
| Many annuals including lambsquarters, morningglory spp., mustards, nightshade, pigweed (redroot), pusley (Florida), velvetleaf, and witchgrass | Preemergence | Atrazine 1.5-2.0 lb | Atrazine 4L 1.5-2.0 qt
or 90W 1.66-2.5 lb |
Spray immediately after planting. Use lower rate on light soils. Shallow cultivation usually will improve weed control. Do not plant any crop except those specified on the label the following year. Do not apply more than 2.0 pounds of atrazine or simazine in any one year. Use a 1:2 ratio of atrazine to simazine on more severe annual grass problem areas. |
| Same as above. | Preemergence | Atrazine 1.0-1.5 lb
+ simazine 1.0-1.5 lb |
Atrazine 4L 1.0-1.5 qt
or 90W 1.1-1.6 lb + Princep 4L 1.0-1.5 qt or 90W 1.1-1.6 lb |
|
| Barnyardgrass, carpetweed, crabgrass (large, smooth), foxtail (giant, green, yellow), goosegrass, johnsongrass (seedling), panicum (fall), purslane (common), and signalgrass | Preplant incorporated | Flufenacet 0.525-0.75 lb | Define 60DF 14.0-20.0 oz | Apply to the soil and incorporate into the top 2 inches of soil before planting, using a field cultivator, disk harrow, or similar implement. Read the label and adjust rate to soil texture and content of organic matter. In the event of a crop failure, corn or soybeans may be planted immediately after a Define application. Small grains may be seeded 12 months after a Define application. |
