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Post-emergence herbicide tank mixtures are an important element of integrated weed management of tough-to-control broadleaf weeds in corn. Environmental conditions, such as those that have favored development of thin cuticles on the leaf surfaces of corn this spring, influence the absorption of post emergence herbicides and potential crop tolerance. Warm, humid conditions promote rapid absorption while cool conditions may slow crop development, herbicide uptake and crop selectivity. Crops under stress may not metabolize herbicides quickly enough to avoid crop injury. Therefore, it is important to take appropriate steps to minimize the risk for injury.
Increased absorption combined with conditions for slow growth, can slow the recovery rate from typically safe herbicide applications. This response is commonly associated with herbicides in the ALS family, although it can also occur with other types of herbicides (Figure 2).
The potential for a crop response to herbicide applications can also increase with enhanced absorption. This can be especially evident with plant growth regulator (PGR) herbicides. At V6 the majority of rapid stalk elongation begins2. Warm, humid growing conditions can enhance the growth rate, increasing susceptibility to brittleness. Application of PGRs during these conditions can increase the risk of stalk breakage. PGRs and other herbicides can have multiple formulations. Ester formulations tend to be absorbed more quickly than amine formulations.
Sources: 1 Hartzler, R. 2001. Changing corn cuticles. Iowa State University Weed Science Online.2 Abendroth, L.J. et. al. 2011. Corn growth and development. Iowa State University Extension. PMR 1009.Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Leaf Design℠ is a servicemark of Monsanto Company. ©2012 Monsanto Company. 05/25/2012 EJP.