Some questions have recently come in looking for herbicide options for corn in later vegetative stages. Adequate pre-emergence herbicides were applied; however, excessive rainfall and sandy soils resulted in weed emergence.
Preemergence herbicides can aid in the control of troublesome weeds such as waterhemp and giant ragweed. They can also result in lower weed densities and a more uniform weed height at the time of postemergence herbicide application, aid in the management of herbicide-resistant weeds, and ultimately help protect crop yield potential and profitability.
Kansas State University Extension provides the different pre- and post-emerge herbicide options for no-till corn and which are most effective for specific weeds.
Source: By Bill Johnson and Glenn Nice, Purdue Weed Science, Purdue University
Waterhemp has been present in Indiana field surveys for at least the last 10 years but recent control issues with glyphosate is moving this weed up on the radar of concern for Indiana growers.
Source: Rich Zollinger, North Dakota State University
If a certain number of days have elapsed since planting or if soybean plants have begun to emerge, proceeding with the planned application depends on the herbicide.
Recent severe hail events in parts of Nebraska have left some fields with tremendous yield loss from hail stones beating down corn plants, knocking ears from plants, or shelling seed from the cob.
Multiple years of OSU research on fall and spring no-till herbicide treatments have consistently shown that the value and effectiveness of residual herbicides for soybeans is maximized when they are applied in the spring, not the fall.
With severe dry weather hitting some areas of the Corn Belt this year, a number of no-tillers have voiced concerns about the effectiveness of post-emergence herbicide applications in both no-tilled corn and soybeans.
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During the Sustainable Agriculture Summit in Minneapolis, Minn., Carrie Vollmer-Sanders, the president of Field to Market who also farms in Northeast Indiana and Northwest Ohio, shared why it is important for no-tillers and strip-tillers to share their knowledge with other farmers.
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