Weed killer damage shows up as stunting/deformation of the newest foliage. I agree with others--that just looks like continuing mite damage to me.
It's also possible that the spray, especially if you sprayed in sun, was harsher than it would be to relatively healthier foliage because the damage that mites do totally compromises the leaf epidermis so severely. But in that case, it would only be putting leaves that were doomed anyway out of their misery.
Russet mites, in particular, are notoriously difficult to control. They don't respond well to most of the more organic options except sulfur, which can't be used in hot weather because of the risk of burn to the foliage. And since they're usually a problem in places experiencing hot, rainless weather, sulfur is often a no-go. Using oils also kills one of the few organic options that can control them without hurting your plants: predatory mites.
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