I have a Japanese Magnolia, there is a dusty grey flim on the leaves, how do I get it off ?

Does it wipe off? Then wipe it off.





If it doesn't wipe off, it may be powdery mildew. There are different preventative steps you can take to keep it from spreading, and to prevent it from happening again next year, but there's not much you can do about the leaves already affected.





When the leaves drop, rake them up and take them away for hygiene.

I have a Japanese Magnolia, there is a dusty grey flim on the leaves, how do I get it off ?
I used to work at a greenhouse and this is a fungus and we used 3 parts water to 1 part Dawn Dish Soap, this contains a small amount of ammonia and other ingredients that kills this.
Reply:I have found that the best cure for powdery mildew is sulfur wettable powder, with just a dab of liquid detergent in the sprayer as a wetting agent. It won't cure the old growth, but will keep the new growth from getting infected. Spray in anticipation of rain, thats when the mildew spores travel.
Reply:Nothing but luke warm water with a little dishsoap!!!...LATER
Reply:Is it just vehicle exhaust ? that can be wiped off or hosed off.





Is it powdery mildew ? looks just like white mold. Home remedy that worked on my plants (roses, ivy) was to add (really) fresh coffee grounds watered in with beer. (not kidding had tried pruning and destroying the debris, but mold came back until coffee and beer!!)





If you have any kind of sprayer you can mix equal parts of water and beer and add 3 Tbs Murphy's Oil Soap (galon mixture) to spray on your plant babies.





Good luck