Check low-lying areas of fields where natural “air drainage” is restricted for frost damage first. To assess seedling viability, split a plant lengthwise through the stem. The growing point should be relatively firm and white or cream colored. Darkening or softening of the growing point indicates a nonviable (dead) plant. Replanting may be warranted if these areas are extensive. Seedlings that have not emerged are somewhat protected by the soil and may be protected from frost except at extremely cold temperatures.
The emergence and growth of young corn seedlings is temperature dependent and slows down considerably with cool temperatures. Planting too early increases the vulnerability of corn by slowing down the germination process and lengthening the vulnerable preemergence period. Additionally, very early planted corn has a greater likelihood of being exposed to frost and cold-temperature damage after emergence. Corn can survive frost if the duration and severity of the frost is not severe. The growing point of corn remains below the soil surface until the plant is approximately at the V6 growth stage, which can keep the plant viable even though the aboveground plant tissue may be killed. In these conditions, yield may be compromised somewhat by delaying the growth and development of the plant.
For more information on this and other topics related to corn production, contact your state extension corn specialist or your local extension educator/agent.
The following is the link to the corn extension specialists: state extension corn specialists.
