Pine tree tops dying
I have pine trees that are over 100 years old. The tops are dying. Is there anything I can do and what causes this?
Hancock County Iowa
The first step would be to get an accurate diagnosis. Plant specimens can be sent to the ISU Plant and Insect Diagnostic Clinic. The clinic's website is https://hortnews.extension.iastate.edu/pidc
Unfortunately the trees are at least 20 tall so a sample will not happen.