Crossword Genius

Plant mould (6)

Ross

I believe the answer is:

mildew

(Other definitions for mildew that I've seen before include "attack of disease" , "White powdery fungus" , "White coating caused by damp" , "Fungal coating on plant" , "Fungus that produces a white growth on organic matter" .)

I've seen this clue in The Guardian.
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