The white material looks like salt or sugar. It can't be wiped off as it seems to be in the main veins of the leaves. But not all leaves have it - only 1 or 2 on every plant. It seems like a problem, as it causes the leaves to break (they stay green and alive though). If it can't be wiped off, may it still be a fungus?
And unfortunately - no neighbours who grow corn.
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