Orange growth on tree leaves and seed pods
The tree has a fungal disease called "rust". Looks a lot like rust on metal but no, those are fungal spores that can spread to other trees. But only specific trees. In this case, it kind of looks like the tree is a serviceberry (Amelanchier sp.) but that is a guess. I suspect this is what we call Pacific Coast Pear rust which will not be a problem to the oaks. Here is some more info on that disease:
Thank you for your time and sharing your expertise.