The dry conditions of last year, the mild winter, and dry conditions this spring have been problematic for conifers. Symptoms of browning have been especially noticeable on last year's growth, or the growth at the ends of the branches. Owners often describe these trees as appearing healthy in the fall, but beginning to show browning in the late winter and spring. In many cases the symptoms appear on the entire tree. Samples submitted have included white pine, concolor fir, spruce, and arborvitae.
Infectious diseases Pinpointing the primary cause of browning is important.
Fungicides can be used as a tool to control needle diseases. However, no benefit is gained by applying a fungicide to a conifer showing browning from drought stress. With close observation, fungal diseases can be distinguished from environmental stress problems. When stresses such as drought are to blame, the symptoms often appear on the entire tree. A close look at diseased pine needles will show spots or banded areas on the needles.