HeatMiser said:
Two things that I can think of...
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Calcium deficiency
Mites
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Check under the leaves for mites. I highly recommend getting a handheld microscope and inspecting the underside of the smallest leaves since that's where they like to hang out. I'm currently battling a heavy broad mite infestation that I mistook for nutrient deficiency. Hope you don't have mites.
  Can't ever remember having a nutrient deficiency ever, as I always start with a good media mix in my containers. Most all my problems come from pests and improper watering, compacted media, to small a container, furry critters...
    Have to agree with ya, sure looks like some type of pest, could be broad mites. Without a pic, 12oclock straight down into new growth area of plant, hard confirm it with just the op's first pic...
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  But other pests can produce similar damage, without scoping the leafs @ least to 40x, will never know for sure... But does it really matter..? As the solution is most always the same for us small garden guys. NEEM, in a soaking drenching dripping spray, this will rescue most plants from almost all soft bodied sucking pests.
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When leafs are curled, stunted deformed new growth, especially in the bud tips with an ingrown type look, give broad mite damage a unique look that once one experiences it and figures it out, not soon to forget that signature mite damage 'look'...
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LaHeat, Neem spray, then spray again in a few days. First prune off all damaged areas as it will never heal and has toxins from the pests that continue to do damage for days/weeks after they are all dead. Burn or bury the infested clippings. Within 1-3 days of the spray you should start to see a good recovery if it was pests/broad mites.
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 Spray all plants in the vicinity of any infested plant.
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Last year pic of my young SRP infested with Broad mites....