Corn School: Managing pre emerge herbicides in dry conditions

Dry spring planting conditions have many growers wondering how their soil-applied residual herbicides will perform as the weather continues to heat up with little meaningful rain in sight.
Research by University of Guelph weed scientist Dr. Peter Sikkema indicates pre-emergence herbicides will still deliver significant value for growers in dry spring conditions. He notes that soil-applied products typically deliver between 50 to 80 percent control even in the absence of an activating rain.
On this episode of RealAgriculture's Corn School, BASF agronomist Rob Miller notes that full activation of the herbicide depends on the active ingredient. Some herbicides require up to 3/4" or more for strong performance while others can make do with 4/10". That moisture, however, needs to come in a single rain event for consistent performance and strong control of late-flushing weeds, adds Miller.
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