The frost that settled over the Neosho River floodplain Tuesday morning was a so-called radiation frost. These type of frosts occur on clear, calm nights when the earth radiates heat back into the atmosphere. During a radiation frost the temperature near the soil surface will be colder than temperatures higher up in the canopies of pecan trees. The temperature gradient that is created by a radiation freeze can end up creating a distinctive kill line in the canopy of pecan trees. Buds below the kill line are exposed to temperatures capable of killing green tissue. Above the kill line, temperatures are slightly higher and pecan buds can escape damage. Yesterday, I used our hydraulic lift to see if I could find evidence of a kill line.
In the photo below, you can see that Kanza buds taken from both heights are still nice and green. Looks like our Kanza trees will be largely unaffected by this freeze.