We are seeing very noticeable natural needle drop on some evergreens such as arborvitae, pines and spruce. This is a process where 2- to 4-year-old interior needles turn yellow, then brown, and eventually drop off. Those who aren't familiar with this process often are concerned about the health of the tree. This is a natural phenomenon that occurs every year and does not hurt the tree. However, some years it is much more noticeable than others especially if trees have been under stress. In most summers, the stress is due to heat and drought but this may vary depending on the year.
Be sure to check that only the older, inner needles are affected. The needles on the tips of the branches should look fine. Also, there should be no spotting or banding on the needles that are turning yellow. If spotting or banding is noted, take a sample to your local county extension office for diagnosis. You can find the location of your local office at http://www.ksre.k-state.edu/about/stateandareamaps.html (Ward Upham)
Be sure to check that only the older, inner needles are affected. The needles on the tips of the branches should look fine. Also, there should be no spotting or banding on the needles that are turning yellow. If spotting or banding is noted, take a sample to your local county extension office for diagnosis. You can find the location of your local office at http://www.ksre.k-state.edu/about/stateandareamaps.html (Ward Upham)
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