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Farms.com Home  › Expert Commentary

Assessing Winter Wheat Freeze Damage

Mar 16, 2017
By Carrie Knott
Extension Agronomist-Princeton
 
 
Last night temperatures dipped below 24°F for several hours throughout Kentucky. Winter wheat at the jointing (Feekes 6) growth stage, was likely damaged by these cold temperatures.
 
Figure 1. Healthy wheat head at the Feekes 6, jointing growth stage. 50x magnification. 
 
To assess wheat freeze damage:
 
1. Wait until high temperatures are at least 40°F for 5 to 7 days. According to the projected weather forecast, most of the state will have high temperatures greater than 40°F the next 7 days. Assess freeze damage next Tuesday or Wednesday. Any earlier than the middle of next week may provide an inaccurate estimate of damage.
 
Figure 2. Healthy wheat head at the Feekes 6, jointing growth stage. 20x magnification. 
 
2. Freeze damaged wheat will have yellow, chlorotic growing points, limp leaves and/or a silage odor. 
There will likely be yellow leaf tips. This is a cosmetic problem only. The real issue is whether or not the growing point was damaged. A healthy growing point will be turgid, somewhat translucent and very glossy (Figure 1 and 2). A freeze damaged growing point will be limp and greenish is color. A hand lens is very helpful at differentiating these subtle differences.
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