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Old 16-04-2003, 07:56 PM
Jim S
 
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Default [IBC] Wilting Maple Leaves

Anyone know what would cause initially healthy new growth on a maple to
suddenly start to wilt?

I don't think I overwatered. The soil is well-draining. It's actually
happened to 2 out of 4 maples I have. Could it be fungal?

Thanks,

Jim

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Old 16-04-2003, 08:44 PM
Brent Walston
 
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Default [IBC] Wilting Maple Leaves

At 01:05 PM 4/16/03 -0400, Jim S wrote:
Anyone know what would cause initially healthy new growth on a maple to
suddenly start to wilt?

I don't think I overwatered. The soil is well-draining. It's actually
happened to 2 out of 4 maples I have. Could it be fungal?


Jim

If you have Japanese maples, Acer palmatum, it is very likely they have a
root fungal disease, one of the dreaded water molds. A. palmatum is very
susceptible to these diseases and they are worst are this time of the year,
striking just after the new growth appears.

Dig around the root crown a bit and look for blackened roots and bark
(sometimes in patches or stripes), a sure sign. There is little you can do
other than to keep them on the dry side with good light, no nitrogen.
Repotting will sometimes work if they are in dense soil, but that doesn't
sound like the case here.

The water molds are a group of root fungal pathogens with similar symptoms.
They are systemic diseases that attack the vascular system so water cannot
proceed up the stem. That is why the leaves wilt. The initial reaction is
to give them more water and this of course exacerbates the problem. It is
very often fatal, but sometimes only part of the tree will be affected and
it will fight off the attack. Since the diesease is systemic, all the over
the counter fungicides are nearly useless.

I can't remember them all, but I believe the water molds include Pythium,
Phytophora, and Fusarium. Another nasty that behaves like this is
Verticillium, but I can't remember if it is referred to as a water mold.

It would be nice for Nina to help us here.


Brent in Northern California
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Old 16-04-2003, 09:32 PM
Ben Griffin
 
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Default [IBC] Wilting Maple Leaves

Im not maple expert but i have allot of them . I
have had a few encounters with root fungus on japanese
maples. "not trident" I use a product called phyton
27 a little bit expensive but it has saved each one.
Mountain Maples also swares by the product and they
have thousands of maples. I cured one of my maples a
coral maple which had verticillium wilt quite bad with
it just last year. I also root pruned off all the
leaves mid summer right before applying and trimmed
off any infected branches. I did a foliar spray and a
root soak

http://www.phyton27.com

Its a copper based root fungicide i beleive.

Good Luck
Ben

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Old 16-04-2003, 11:33 PM
Jim S
 
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Default [IBC] Wilting Maple Leaves

Thanks for the feedback.

These are not Japanese maples, but I'm not sure beyond that.

They were kept in an unheated garage in Pennsylvania, and may have been
subject to very cold temps this winter.

All the leaves on the 1 are badly wilted. The other 1 only some of the
leaves. They are not crispy, just like a wet noodle. I'll check the roots
and see if I can see signs of a fungus.

Jim

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Old 21-04-2003, 05:09 PM
Nina Shishkoff
 
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Default [IBC] Wilting Maple Leaves

Brent said:

If you have Japanese maples, Acer palmatum, it is very likely they have a
root fungal disease, one of the dreaded water molds. A. palmatum is very
susceptible to these diseases and they are worst are this time of the year,
striking just after the new growth appears.


The water molds are a group of root fungal pathogens with similar symptoms.
They are systemic diseases


No, actually, water molds aren't systemic. But because they kill
roots, they doom the rest of the plant.

Since the diesease is systemic, all the over
the counter fungicides are nearly useless.


Over-the-counter fungicides may work *preventively*, but once the
tree has root rot, it's on its own to fight it off.


I can't remember them all, but I believe the water molds include Pythium,
Phytophora, and Fusarium.


Pythium and Phytophthora are water molds, Fusarium is a true fungus
that causes damping-off or systemic infection. Mycologists have
always known that water molds weren't really fungi, but now it's
official: they're algae. The NYTs now refers to them as
"fungus-like" organisms.

Another nasty that behaves like this is
Verticillium, but I can't remember if it is referred to as a water mold.


This is another true fungus that causes systemic infections, and is a
scourge of maples.

Anyway, I agree with all the advice Brent gave on treatment: don't
overwater, repot if the soil is dense, watch and wait.



--
Nina Shishkoff

Frederick, MD

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