Black film on gardenia leaves

natalie4b(7b GA)April 27, 2008

What is the black residue on the leaves of my gardenia shrub? It comes off when I wipe it. How do I treat it?

Thank you in advance!

~Natalie

Thank you for reporting this comment. Undo
jean001(z8aPortland, OR)

Most likely sooty mold which is secondary to honeydew excreted by one or several insects.

On a gardenia, I'd suspect mealybugs, aphids, whitefly and/or scale.

Once you find the critters,you should treat them.

    Bookmark   April 27, 2008 at 10:21PM
Thank you for reporting this comment. Undo
natalie4b(7b GA)

Thank you Jean001. I will inspect the foliage for bugs. Hopefully the blooms will not be affected.
Happy gardening!
~Natalie

    Bookmark   April 28, 2008 at 11:32AM
Thank you for reporting this comment. Undo
rhizo_1 (North AL) zone 7

In the South, it's often said, "if you have gardenias, you WILL have whitefly."

    Bookmark   April 28, 2008 at 1:03PM
Thank you for reporting this comment. Undo
ncdirtdigger(7b)

I have found Bayer's systemic insecticide effective in treating whiteflies on Gardenias (pricey though)

    Bookmark   April 28, 2008 at 9:14PM
Thank you for reporting this comment. Undo
natalie4b(7b GA)

Is it the same as Bayer all-in-one? I recently purchased it for roses.

    Bookmark   April 29, 2008 at 7:20AM
Thank you for reporting this comment. Undo
conifers

Yes to the Bayer all-in-one.

Sooty Mold, yes...

Dax

    Bookmark   April 29, 2008 at 11:55AM
Thank you for reporting this comment. Undo
rhizo_1 (North AL) zone 7

The all-in-one products contain fungicides, insecticides, and fertilizers and/or miticides....and are not the same product as the Bayer's systemic pest control for shrubs. I'd advise against using the former, unless you actually have all of the above problems.

Once you've identified the pest, let us know! Or...if you aren't sure what it might be post an image or give us a good description so that we can ID it for you.

Once you can get control of the critter, the sooty mold will go away on its own.

    Bookmark   April 29, 2008 at 1:43PM
Thank you for reporting this comment. Undo
natalie4b(7b GA)

Thank you all for your recommendations and advice!
~Natalie

    Bookmark   April 29, 2008 at 2:15PM
Sign Up to comment
More Discussions
Best thorny shrub to plant in front of window?
I am looking to plant a thorny shrub in front of my...
Ryan Kelley
County Extension/Horticulture agents
Folks, many of us here make frequent recommendations...
wisconsitom
What would be a good flowering shrub in Zone 9?
Hello I'm looking for a good flowering shrub that I...
flyinbtsomypants (WestCent.FL Z9b-10a)
Hakuro Nishiki willow, planting near house?
Hi all, I live in Seattle and recently bought a house...
nr78
Illicium simonsii - anyone have experience with it?
I just came across Illicium simonsii at a local nursery...
Dave in NoVA • 7a • Northern VA
© 2015 Houzz Inc. Houzz® The new way to design your home™