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What is wrong with my pineapples?
>1-1.5 years old
>All developed yellow spots that eventually turn brown
>Old leaves and brand new leaves mostly affected
>Brown spots have grown larger on younger leaves
>No other disease symptoms
>No wounds from pests
>Have not been overwatering
>Leaves look otherwise healthy including tips
>Spots developed 2.5 months into 4 month indoors during winter
>Soil PH is fine, not root bound
>Tried treating with chelated iron, iron/zinc/magnesium foliar spray, dilluted neem oil spray