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Guidelines for Post Emerge Weed Control in Corn Mike
Rankin Post-emerge weed control programs in corn are becoming as commonplace as knee surgeries on Barry Bonds. WHEN weeds are controlled is nearly as important as IF weeds are controlled. If annuals such foxtails were controlled too early (0.5 to 1.5 inches), control is reduced and yields suffered due to late season flushes of the weed (assuming no residual herbicide is applied). However, if control is late (>6 inches), corn yields are reduced from early season weed competition. A good objective is to treat weeds when the tallest plants are about 4 inches in height. This will insure both good weed control and help minimize yield losses.
Correctly staging the corn crop is important to avoid crop
injury. In general, corn is more tolerant as a small seedling and the
risk for crop injury increases as the plant becomes larger. However,
there are a few exceptions to this rule (e.g. Beacon). The following
table provides the range of maturity stages that corn can be treated based
on label recommendations.
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