Douglas Fir sap stream - insects needing treatment or normal?
We have several large Douglas Fir trees in our backyard. One of the largest has developed a few sap streams (see photos). In reading online, there are various opinions expressed about how "normal" such streams are and whether they should be left alone or treated. One page mentioned a moth that usually does only minor damage, but also a beetle that is more dangerous to the tree. I don't see any other streams on the trees we have. Thanks in advance for any guidance or advice. We'd hate to lose this tree because it's over 100ft tall and a centerpiece within the landscape.
Thank you. That is helpful information. That first photo shows the full extent of the sap, so there are not any other streams. It's all below 5' above the ground; we do see woodpeckers drop by, but generally higher up. There has been no limb-fall in that area. I have not seen any sort of friable material on the tree or on the ground below the sap streams. So, I hope this is just a minor issue that the tree can clear up by itself. We'll keep an eye on it using that photo to see if it gets any larger with time.