Originally Posted by Mark Oomkes
I'm guessing the pitch is unrelated.
I agree on point of the needle yellowing and the pitch being unrelated.
The yellowing actually just looks like "natural fall inner needle drop". Which is a normal cycle for the inner-most evergreen foliage to yellow and shed in the Autumn season.
All sap on evergreens is of a white to yellowish color. Thus making it more noticeable on tree bark, as opposed to the clear sap of deciduous trees.