Morningglory control in corn has been topic of discussion this week. In Georgia, morningglories are particularly difficult to manage because residual herbicides do not provide full-season control and corn maturation in late June/July allows ample sunlight to reach the soil surface which stimulates late-season emergence/growth. In heavy infestations, complete control of morningglory is almost impossible in our environment. Dr. Eric Prostko, UGA Corn Weed Specialist, discusses a few tips on managing morningglory in corn…
A few things to consider: 1)Use a PRE (1 qt/A) and POST (1.5 qt/A) application of atrazine (4 lb ai/gal). The second application of atrazine must be applied before the corn exceeds 12” in height. POST applications can be delayed until that time to extend residual control.
2)Consider using the Liberty-Link (LL) system. Generally, Liberty is more effective on morningglory than glyphosate. Atrazine can be tank-mixed with Liberty for residual control.
3)Other herbicides that can be tank-mixed with glyphosate to improve the control of morningglory include, 2,4-D, Clarity, Status, Aim, and ET.
4)Consider using a LAY-BY or PDIR application of Evik.
5)Consider using a harvest-aid such as Aim. Late-season applications of Aim will not completely remove morningglory plants from a field but will desiccate the vines enough to improve harvest. Aim has no effect on smallflower morningglory.
6)Harvest corn early before morningglory plants take over the field. Obviously, this management tactic will necessitate the use of on-farm drying/storage facilities.
If you have any questions please feel free to contact your local county agent.