Yellow tips on Scots Pine

Hi,

I have this Pine since 2010 and this year for the first time I've noticed the tips of the needles are yellowing.
What can be the problem? The soil is Akadama-Pomice 30-70 and it was repoted two years ago.
The needles this year have been larger because I fed it with more Biogold than I used to, a rainy Spring and this days with higher temperatures.
I don't know what to do, what do you think?



Thank you

my initial though would be too much water...
especially in a 50/50 akadama/pumice mix !

Hi Kevin, I don’t know what I have been thinking when I wrote 50-50...even my deciduos trees have more Pomice than Akadama.
What soil do you use for Pines?

I agree with you that  can be too much water, during a month almost every day it was raining.

Another culprit could be a new sistemic insecticide, Dafene of Bayer...because other trees have symptoms of burned leaves...

I’ll show you other leaves:

Buerger:



Liquidambar:



Cork oak: