Noticing hite fuzz on any kind of greenery might make you cringe, but if it's only on the stems and leaves of your tomato plants, it may be a good thing.
What White Hair On Tomato Plants Really Means (And What To Do About It)

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Noticing hite fuzz on any kind of greenery might make you cringe, but if it's only on the stems and leaves of your tomato plants, it may be a good thing.