white stuff on my baby Poplar tree...

johnthelandlordOctober 8, 2013

Not sure why, it seems to be otherwise growing properly. I have grown it from a seed. Other Poplar in the area are getting their leaves browning for the fall season but I don't notice the white stuff on them.

Any ideas?

Thank You

Thank you for reporting this comment. Undo

another pic

    Bookmark   October 8, 2013 at 4:44PM
Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

Probably powdery mildew. To late in the year to spray.
Best management for now is to discard the leaves as they fall.

Also, get the tree into the ground.

    Bookmark   October 8, 2013 at 7:39PM
Thank you for reporting this comment. Undo

Looks like powdery mildew to me as well. BTW, although some people refer to this as a poplar, it isn't. Liriodendron are actually in the magnolia family.

    Bookmark   October 8, 2013 at 8:48PM
Thank you for reporting this comment. Undo

Thank you for the replies. What caused the mildew and how can I prevent it on its new leaves in the spring? I grew one a few years ago and it did not have it. it was in a pot for about 2.5 years before put in the ground.

    Bookmark   October 8, 2013 at 9:15PM
Thank you for reporting this comment. Undo
ken_adrian Adrian MI cold Z5

hot warm nights...

its a mildew.. surely you know where mildew grows.. in the dark .. in dank humid windless areas ...

insure the plant goes into darkness dry .. no after dinner wetting ...

increase air movement if possible .... by removing surrounding plants ...

and.. its a tree... plant it in the ground ... trees are extremely hard.. to grow in pots ...

it may never happen again ... there is no cure ... in a given season ...

it can be prevented with simply baking soda and water.. i am sure you can google that ...

i have a dozen of them ... NEVER had this problem.. so.. i suspect.. its something you are doing ...

full fall cleanup.. get rid of the leaves.. and i might even wash down the pot with that baking soda stuff.. to remove any potential overwintering spores.. and i wouldnt even research it.. because i have it laying around.. and its basically free.. harmless.. and would take about a minute... shorter than firing up the computer ....


    Bookmark   October 9, 2013 at 8:59AM
Thank you for reporting this comment. Undo

You're growing tulip poplars from seed -- nice! That powdery mildew won't hurt anything. The little thing is about to go dormant anyway. And once you get it in the ground and it matures, chances are the PM won't be a problem.

Liriodendron tulipifera -- that's your tree, and one of my favorite latin names. I think it's far too nice to just be called a "poplar".

    Bookmark   October 9, 2013 at 10:28AM
Thank you for reporting this comment. Undo
rhizo_1 (North AL) zone 7

Yep, powdery mildew and Liriodendron is fairly susceptible to tbis disease if the conditions are right. It tends to show up when temperatures begin to cool down, but the air is still humid. Warm days and cool nights are perfect for PM.

This fungus does not need sitting water on the leaves in order to germinate, contrary to what many people believe....just humidity. As a matter of fact, spraying the foliage with plain water can be the simplest control, if caught early enough. Water kills PM spores. That's all I've ever used, as long as I spot it soon enough.

At this time, don't worry about it; your tree is about to lose its leaves for the winter. I would absolutely treat the bare twigs with horticultural oil in the spring...just before the swollen buds begin to break.

The potting medium must be one that is very porous, fast draining. Woody plants do best when grown in a bark based mix. The typical houseplant medium is not the best option for a woody plant.

The location should be sunny and in an area of good air circulation. Avoid excess fertilization.

There are many good options for prevention......plain water sprays, insecticidal soap, and neem are great preventative solutions. Some people recommend milk sprays or baking soda but be sure to research the mixing rates. Should you not be able to keep it rinsed away and infection occurs, Neem oil can cure a mild infection.

Lots and lots of good information about this disease on line. Do some reading and you'll feel more confidant. It's not a mildew, per se, but a true fungal disorder. In ground trees can get it, too, if the conditions are right.

PM spores travel in the wind. Check around to see if there are any other infected tulip poplars around just out of curiosity.

    Bookmark   October 9, 2013 at 11:21AM
Thank you for reporting this comment. Undo

Thanks everybody for all the replies and ideas.

    Bookmark   October 9, 2013 at 1:49PM
Sign Up to comment
More Discussions
Acacia invaded by Caterpillars!
My wife and I don't know what to do. We have a small...
Pepper problem
I am a doctor and gardening beginner, trying my luck...
what can I do to save this tree?
This is a Cheery tree that I planted last year.
Seedlings being cut by pest
My precious seedlings are being decapitated by an unknown...
Lilac Concerns
My lilac plant is... frying? ... Lives in zone 8a One...
Sponsored Products
Ten Warm White Old Time LED String Lights
$44.99 | Lamps Plus
Facile white wall clock 8"
Origin Crafts
Modern Plastic E27 Pendant Lighting White
$7.95 | ParrotUncle
Rite Lite Grey 5 LED Puck Light (3 Pack) LPL623
$15.38 | Home Depot
Matte Black One-Light Pendant with White Mottle Glass
$120.00 | Bellacor
24 Inch Bathroom Vanity Set
© 2015 Houzz Inc. Houzz® The new way to design your home™