No. 6 Article 5/May 4, 2007

Postemergence Applications of "Soil-Applied" Corn Herbicides

Soil-applied herbicides continue to be widely utilized for weed management in Illinois corn fields. It is likely that because of the planting delays caused by wet soil conditions, some corn fields were planted before the herbicide was applied and the crop has now emerged. Corn farmers should be aware that many, but not all, soil-applied corn herbicides can be applied after corn emergence. Not all of these herbicides will control emerged weeds, so additional management procedures (such as the use of a rotary hoe or the addition of a herbicide that has postemergence activity) may be needed in situations where weeds also have emerged. Farmers are also cautioned about the potential for enhanced corn injury if these products are applied during periods of crop stress, such as stress caused by excessive soil moisture, cool air temperatures, and so on. Table 2 summarizes information about postemergence applications of the more traditional soil-applied corn herbicides. Consult the respective product label for additional information, such as the need for spray additives.--Aaron Hager

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