Though I've never seen this on flower spikes, one of my first thoughts was thrips. The damage pattern is very similar to what you'd see on leaf or floral tissues. The marks you see on the leaf could also be explained by thrips. They hide down in the crown and suck on young leaf tissue, and when the leaf further emerges the damage looks like whitish scars, often in a V shape across the leaf surface. Is there anything visible on the top side of the leaf?
It could also be spider mites as ES suggested.
Either way, an insecticidal soap or wiping down with rubbing alcohol should help, though repeated applications are likely necessary.
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Camille
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