Chlorotic Pin Oak

Question:

 Last year I noticed that the leaves of my 4-5 yr. old pin oak were yellowish green. This year the leaves are quite yellow and many are undeveloped. Some of the small lower branches are dead. Scratching the bark shows green but not very much moisture. Is there a treatment available to correct this problem?

Minnesota Master Gardeners say:

 Iron chlorosis (yellowing) may be caused by a number of factors. Pin oak is particularly susceptible to chlorosis when it is planted in alkaline soil or heavy clay. Check this link to learn more about causes of chlorosis and what can be done to improve soil conditions for your tree. http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/h411ironchlorosis.html

If you are uncertain about the pH of your soil, a soil test may be in order. Check this link for information about how to prepare a soil sample and where to send it.
http://soiltest.coafes.umn.edu