Iowa Department of Natural Resources (DNR) foresters have received numerous reports of significant winter burn damage affecting arborvitae and white pine trees throughout the state. Tivon Feeley, DNR forest health forester, attributes the damage to prolonged frozen ground and above-freezing temperatures seen earlier in the year. This weather pattern led trees to utilize their water reserves in needles without replenishing from frozen soil, resulting in desiccation. Winter burn is commonly seen in conifers planted in exposed, open locations and manifests as browning or bleaching needles, needle loss, and potential tree death. Symptoms worsen on the side exposed to winter elements. Staff advises that if tree buds are alive, new foliage may replace the burned needles, but if both buds and needles perish, the tree won’t recover and must be removed. While prevention isn’t feasible, reducing risks involves proper mulching and adequate hydration before dormancy. The DNR advises against planting conifers in newly established windbreaks due to slower growth and increased susceptibility. Residents are urged to contact local district foresters for guidance.
