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Mississippi: Control Italian Ryegrass in Corn before Planting

February 6, 2017

Glyphosate-resistant Italian ryegrass has become a primary weed in corn fields in Mississippi. According to AgFax and Mississippi State University, it’s important to control the weed as early as possible with a targeted early burndown.

A general rule of thumb is that if corn fields can be maintained weed free for the first 4 to 5 weeks after emergence, there will be no negative effects on yield due to weed competition. However, this rule applies only to weeds that emerge at the same time or immediately following corn – it doesn’t apply to glyphosate-resistant Italian ryegrass which is usually 12 to 24 inches tall during corn planting season in the Mississippi Delta.

Research at the Mississippi State University Delta Research and Extension Center said that at least 2 herbicide applications are required for greater than 90% control of glyphosate-resistant Italian ryegrass.

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