By Scout Nelson
Herbicides are essential for managing weeds in cornfields but using them correctly is crucial to avoid crop injury or environmental issues. Herbicide labels specify growth stage cutoffs or crop height restrictions for applications to ensure effectiveness and safety.
These cutoffs are essential in maintaining crop health and preventing concerns like herbicide carryover, environmental contamination, and food safety risks. Additionally, preharvest intervals (PHI) indicate the minimum time required between herbicide application and crop harvest to avoid residue problems.
For field corn, the growth stage or height cutoffs can differ based on the type of corn being grown, such as seed, sweet corn, or popcorn. When mixing herbicides, it’s important to follow the most restrictive cutoff from the product labels. Always consult herbicide labels before applying to ensure compliance and maximize the safety of your crop.
The updated guidelines (as of June 17, 2025) offer a comprehensive table summarizing the growth stage cutoffs and PHIs for common postemergence herbicides. These updates provide clearer instructions for proper herbicide use in different corn varieties, helping to prevent unintended consequences.
As you apply postemergence herbicides, remember that timely applications can ensure effective weed control and improve yields. Following the label instructions and growth stage cutoffs are key to avoiding crop injury and environmental concerns. Always stay informed about the latest recommendations and use herbicides responsibly.
Photo Credit:gettyimages-fertnig
Categories: Minnesota, Crops, Corn