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there is either some kind of contam keeping it from colonizing that area or it just hasnt' got there yet. my guess is there is a reason it is not colonizing. what have you got there anyway, crumbled and cased cakes? what? if these are that then they are way overlayed. are these being fruited? whats the history of them til this point?
Both casings are pinning moderately well... they've been being fanned for a little over a week. I can see little mushroom heads popping out all over the casing on the left, the one with the yellowing isn't pinning as well but it still has a few coming out here and there.
They are in coco coir and vermaculite, with crumbled colonized WBS substrate.
So should I dig up the light yellow spots before it gets any worse?
The yellow is most likely just metabolite , commonly referred to as mycelial "piss". My casings get the same yellow tint as they age.
How old is this casing? The large uncolonized area is strange , my casings usually colonize evenly with no patching needed. Patching is placing casing substrate over the first strong patches of growth which pop-up , giving the rest of the casing time to catch up. Something you may want to try since I can see large areas of overlay in the corners opposite the uncolonized area , it's the stuff which looks like a solid white matt.
Hopefully you will be able to get at least one flush from it before the mean green hits , odds are the large uncolonized area will get contaminated. Good luck