1. Trees that had expanding leaves and exposed catkins on April 15 were hardest hit by the freeze.
2. Cultivar origin had little impact on severity of cold injury. Worst hit cultivars included Hennings (a far northern cultivar) and Maramec ( a southern pecan).
3. Frost damage much worse on lower branches.
4. Frost damage varies widely within a tree; from branch to branch and from bud to bud.
Let me show you some examples of how our trees are responding to the April 15 freeze.
The photo above shows three branch terminals all growing from a single larger branch of the USDA clone 64-11-17. The shoot in the middle appears to be growing normally with no apparent cold injury. The shoot on the right has a green terminal bud but mid-shoot buds look frozen and not greening up. The shoot on the left looks totally damaged by the frost. This is the kind of wide variation in cold injury we are seeing throughout the grove.