Recent reports of emergence problems in corn (see photos) suggest that the earlier cold temperatures and heavy rains have had a lasting impact on corn stands. Reports are widespread across Iowa and the symptoms have been variously described as a "toughened" coleoptile or membrane that does not allow the seedling corn plant to emerge properly. The result of a coleoptile that fails to "release" the developing leaves is a plant that "cork screws" underground, or leaves that rupture out of the coleoptile on the side rather than emerging through the tip. The problems with the coleoptile are primarily the result of the cold and wet conditions.
Iowa State University
Owen, Micheal D.; Hartzler, Robert G.; and Schaefer, Kristine J. P., "Cold weather stresses corn; herbicide injury possible" (2005). Integrated Crop Management News. 1408.
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