date:Apr 28, 2013
of the whorl are chlorotic, then the head on that tiller is dead.
Boot: If tillers were in this stage at the time of the freeze, there are several possibilities. The head may be fine, it may be partially damaged, or it may have been completely killed. In any of those cases, the head may continue to emerge.
If the head is fine, it will turn from lime green in the boot to a darker green when it emerges. If the head is freeze-damaged, some or all of the spikelets will become yellow and/or waters