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The following are general recommendations for POST herbicide applications for corn and soybean:
Scout fields to accurately determine the growth stage of the crop and the degree of variability that may exist across the field. Weed species that are present and their height should also be recorded. Always follow crop size limitations per product label in order to prevent crop injury and facilitate good weed control.
The rate for the field should be determined by the largest or most difficult to control weed, not the most prevalent. For example, if the field has predominantly 3- to 4-inch velvetleaf, but also contains numerous 12-inch lambsquarters, the recommended rate should target the height of the lambsquarters.
Avoid making POST applications during abnormally cool or dry, droughty weather since weeds may not be actively growing under these conditions. Delaying application until weeds resume active growth may result in improved control. Herbicide penetration and activity are usually improved when the temperature and relative humidity is high, but the potential for crop injury may also increase under these conditions.
The use of an adjuvant is often recommended on product labels to improve spray coverage and herbicide uptake. Weed control may improve with the use of adjuvants, but crop injury may increase. Always follow product label instructions regarding the use of additives. Use the most restrictive label directions when considering tank-mix combinations.
Reminders for POST applications of Roundup® brand agricultural herbicides to corn or soybean with a Roundup Ready® technology and Roundup Ready 2 Xtend® soybean
Reminders for POST applications of XtendiMax® Herbicide with VaporGrip® Technology to Roundup Ready 2 Xtend soybean: