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Pyracantha with yellow brown leaves

What is this whereas the leave are yellow with a brown rust in the middle of the leaf. I thought it might be over watering but I just planted this a week or two ago.
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Being evergreen, there will always be some leaves going over and being replaced but if you get a lot doing it at once it's usually a sign of shock from planting in poorly prepared soil or inadequate watering. Having been planted so late in spring it will need watering all thru its first summer and into autumn while it gets its roots down into its new home.
On the other hand, over watering can also turn leaves brown or it may have been accidentally sprayed with weed killer which can also cause spotting and yellowing of affected leaves.
It looks like quite a big specimen, so it will need plenty of water until established, especially if the sit's on the dry side. Once established, they cope with most sites and situations.
I live in west central Scotland - not where that photo is...
In saying all that, I took a screen grab to look at more closely and it does look a somewhat unusual pattern of discolouration, did you fertilise it or spray it with anything?