Scotspine yellow tips

During fall shoot selection, Ryan neil mentions about yellow tips on pines. He mentions that he’ll discuss this at a later date. What videos is this? Or infact maybe someone can explain what it is and why it happens? Because my scotspine has it.

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Hi, looking for same answer here for JBPs 2 years latter. Have you please found some conclusion?
Trees are apparently healthy and thriving. We are entering summer down here.
Cheers