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What Are Your Herbicide Options for Large Palmer Amaranth in Corn?

Corn planting is winding down in Tennessee. A good bit of the early April-planted corn will need to be sprayed post shortly.

Wet weather in the forecast will likely make for a narrow window to get these fields sprayed timely. As a result, there is likely to be some good size Palmer amaranth up in some corn fields by the time we can get back into spray.

A common question is how large a pigweed will the popular layby premixes Halex GT, Capreno and Realm Q control? All three of those herbicides are a bleaching-based herbicide premix. The bleaching herbicide in Capreno is Laudis. The bleaching herbicide in Halex GT and Realm Q is Callisto. Those herbicides can effectively control Palmer up to 4 inches tall, depending upon rate.

When Palmer becomes larger than that, a tank-mix partner is needed for consistent control. The most commonly used tank-mix partner is atrazine. When atrazine is tank-mixed in with one of the herbicide premixes mentioned above, considerably larger Palmer can be controlled. However, atrazine can only be used on corn up to 12” tall.

Read more of the news article here