Gray Mold on Leaves - Can You Help Identify and Recommend Fix?

rnewste · May 28, 2008

Just discovered this today on a few plants. The mold is only showing up on the shady (North) side of the plant. Leaves in the Sun do not exhibit this. Can you identify, and recommend a solution (diluted bleach, maybe) to treat the problem?

thanks,

Ray

rnewste · May 28, 2008

By the way, it is not Cladosporium fulvum. The mold is a fuzzy gray, only on the top of the leaf - - nothing on the underside.

Ray

dice · May 28, 2008

Looks like mildew or botrytis. For mildew, you can try a
baking soda solution (usually works). For botrytis, you
need to remove infected parts and perhaps use a
commercial fungicide (copper-based was reported
to work on botrytis infected geraniums).

barkeater · May 30, 2008

If it is botrytis (grey mold), Downy or Powdery mildew, Daconil is labelled for all of them.

I always have a grey mold problem with my lilies, and already saw some 10 days ago, and Daconil, sprayed religiously, suppresses it well.

And even with regular use on my tomatoes, I've had a couple plants the past couple years that lost some main stems to botrytis. Both times they were very dense plants constricted too much by their cages.

**carolyn137** · May 30, 2008

Ray has posted the same question at GW and at least two of us have IDed it as being the Oidium type of Powdery Mildew. Not that uncommon when the June Glooms hit CA.

The thread at GW is a long one b'c of posts having to do with possible treatments.

RonnyWil · June 1, 2008

I'd try hydrogen peroxide. It should kill the mold and keep it from spreading. Try this link:
http://www.using-hydrogen-peroxide.c...de-garden.html

May 28, 2008	#1
rnewste Tomatovillian™ Join Date: Apr 2007 Location: Campbell, CA Posts: 4,064	Gray Mold on Leaves - Can You Help Identify and Recommend Fix? Just discovered this today on a few plants. The mold is only showing up on the shady (North) side of the plant. Leaves in the Sun do not exhibit this. Can you identify, and recommend a solution (diluted bleach, maybe) to treat the problem? thanks, Ray

May 28, 2008	#3
dice Tomatovillian™ Join Date: Jan 2007 Location: PNW Posts: 4,743	Looks like mildew or botrytis. For mildew, you can try a baking soda solution (usually works). For botrytis, you need to remove infected parts and perhaps use a commercial fungicide (copper-based was reported to work on botrytis infected geraniums). __________________ -- alias

May 30, 2008	#5
carolyn137 Moderator Emeritus Join Date: Jan 2006 Location: Upstate NY, zone 4b/5a Posts: 21,169	Ray has posted the same question at GW and at least two of us have IDed it as being the Oidium type of Powdery Mildew. Not that uncommon when the June Glooms hit CA. The thread at GW is a long one b'c of posts having to do with possible treatments. __________________ Carolyn

June 1, 2008	#6
RonnyWil Tomatovillian™ Join Date: Feb 2007 Location: Collierville TN Posts: 106	I'd try hydrogen peroxide. It should kill the mold and keep it from spreading. Try this link: http://www.using-hydrogen-peroxide.c...de-garden.html __________________ I'm two days older than dirt and I like to play in it.

May 30, 2008	#4
barkeater Tomatovillian™ Join Date: Jan 2006 Location: NE Kingdom, VT - Zone 3b Posts: 1,439	If it is botrytis (grey mold), Downy or Powdery mildew, Daconil is labelled for all of them. I always have a grey mold problem with my lilies, and already saw some 10 days ago, and Daconil, sprayed religiously, suppresses it well. And even with regular use on my tomatoes, I've had a couple plants the past couple years that lost some main stems to botrytis. Both times they were very dense plants constricted too much by their cages.