What are these black spots on my brand new treated pine deck?

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What are these black spots on my brand new treated pine deck?

Hi,

I've just had a new deck installed with treated pine. I was about to oil it but I've noticed these black spots appear on a number of boards. Does anyone know what this is and how to fix it? Many thanks.

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What are these black spots on my brand new treated pine deck?

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What are these black spots on my brand new treated pine deck?

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