My mint plant has powdered white/gray substance on leaves.?
Question:Any idea what it might be, or how to get rid of it?
Answers:
sounds like it might be powdery mildew ( a fungus)
if it is a fungus then it is likely caused by repeated waterings or rain.usually harmless although it isn't something you would want to eat for taste reasons.
Most powdery mildew is harmless and goes away once it dries up.
If your mint is for culinary use then do not spray it with fungicides or soaps. If the plant is only for decoration then go for it.
http://ohioline.osu.edu/hyg-fact/3000/30...
In many cases, powdery mildew diseases do little damage to overall plant health, and yearly infections can be ignored if unsightliness is not a major concern. For example, lilacs can have powdery mildew each year, with little or no apparent effect on plant health. On some plants, powdery mildews can result in significant damage. Thus, fungicides must be used to achieve acceptable control. For best results with fungicides, spray programs must begin as soon as mildews are detected. Spray on a regular schedule, more often during cool, damp weather. Use a good spreader-sticker with the fungicides. Be sure and cover both surfaces of all leaves with the spray. Fungicides generally recommended for powdery mildew control include: Triadimefon (Bayleton, Strike); Triforine (Funginex), Thiophanate-methyl (Cleary's 3336, Domain) and Propiconazole (Banner).
hope this helps.
Sounds like a mold.
You should be able to get a fungicidal soap spray from a nursery or garden center. Make sure it doesn't spread to other plants near by.
could be powdery mildew.. there are antifungal sprays for it. Act quickly.. it adversely affects the plant.
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