White patches on trunks and leaves that are yellow with brown areas are on the red mulberries. I do know web worms are present on one of the trees but don’t know what is happening here. Trees are in wooded area. No other trees affected.
Leaves
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It might be Ambrosia beetles but I’m not 100% sure. Pictures are a little blurry.
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Doesn’t look like ambrosia…I’m familiar with that. It’s like a fluffy white patches…not woody. It’s bright white like meringue spattered on the trunk…
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Couldn’t be lichens, could it?
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Kinda looke like the wooly aphids I’ll get sometimes on my apples. I usually see them on stems and not so much on the bark. Anyway, I paint diluted Neem on the area and they go away.
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Are you sure it’s mulberry?
The leaves look suspicious. Perhaps Red-bud, Linden, or Elm?
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I’ve eaten mulberries off it
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Can you send me some?
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I don’t know. Maybe. I would have said no but I looked up some images and maybe. I need to go back out there and look for the pattern of where it is. If you roughly rubbed some dry spackle on the trunk it would look similar. 
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