I have many Crab apples that have been grown from seed over the past 15
years. Some are now starting to thicken up and a couple are flowering.
Some of the best shaped ones have developed crown gall. After a lengthy
and disheartening Google session I found Brents article on Crab Apples.
The part I'm interested in states:-

"Crown gall is sometimes a 'problem'. This is a parasite that makes
warty nodules on the surface roots and crown of the plant. It seems to
cause no adverse symptoms, and some of my trees have lived with it for
years. The wonderful thing about it is that it creates spectacular
nebari. I have one plant in training that has about a two inch trunk,
but the gall covers about ten inches of root surface, which will nearly
fill the pot when it is finished"

I've seen no adverse effects in the growth of the trees either but many
of the Agricultural Extension Agents and other Tree disease specialists
state that the trees should be destroyed.

Just wondered what experience anyone else has, or if Brent still holds
this view.

Best wishes

Kev Bailey
Zone 9 Wales UK




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I've seen no adverse effects in the growth of the trees either
but many
of the Agricultural Extension Agents and other Tree disease
specialists
state that the trees should be destroyed.

Just wondered what experience anyone else has, or if Brent
still holds
this view.

If you live in an area where apples or pears are a major
commercial crop, perhaps some concern might be warranted. I
doubt, however, that much is gonna spread from a bonsai or two.

I think I recall, though, that the dreaded Chinese (longhorn??)
beetle has spread from imported trees -- as well as crates and
packaging.

Jim Lewis - - Tallahassee, FL - Only where
people have learned to appreciate and cherish the landscape and
its living cover will they treat it with the care and respect it
should have - Paul Bigelow Sears.

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I've seen no adverse effects in the growth of the trees either
but many
of the Agricultural Extension Agents and other Tree disease
specialists
state that the trees should be destroyed.

Just wondered what experience anyone else has, or if Brent
still holds
this view.

If you live in an area where apples or pears are a major
commercial crop, perhaps some concern might be warranted. I
doubt, however, that much is gonna spread from a bonsai or two.

I think I recall, though, that the dreaded Chinese (longhorn??)
beetle has spread from imported trees -- as well as crates and
packaging.

Jim Lewis - - Tallahassee, FL - Only where
people have learned to appreciate and cherish the landscape and
its living cover will they treat it with the care and respect it
should have - Paul Bigelow Sears.

************************************************** ******************************
++++Sponsored, in part, by Ken Rutledge++++
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Kevin,
I had a number of apple trees that were collected, about 45 years of age and
they had the nodules on the roots. I never had one die or even suffer from
the disease. In fact, the appearance of the surface roots was so good I
tried to introduce it to other apples!
Jerry Meislik
Whitefish Montana USA
Zone 4-5
http://www.bonsaihunk.8m.com/
I have many Crab apples that have been grown from seed over the past 15
years. Some are now starting to thicken up and a couple are flowering.
Some of the best shaped ones have developed crown gall. After a lengthy
and disheartening Google session I found Brents article on Crab Apples.
The part I'm interested in states:-

"Crown gall is sometimes a 'problem'. This is a parasite that makes
warty nodules on the surface roots and crown of the plant. It seems to
cause no adverse symptoms, and some of my trees have lived with it for
years. The wonderful thing about it is that it creates spectacular
nebari. I have one plant in training that has about a two inch trunk,
but the gall covers about ten inches of root surface, which will nearly
fill the pot when it is finished"

I've seen no adverse effects in the growth of the trees either but many
of the Agricultural Extension Agents and other Tree disease specialists
state that the trees should be destroyed.

Just wondered what experience anyone else has, or if Brent still holds
this view.

Best wishes

Kev Bailey
Zone 9 Wales UK

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Well, that's not a good idea. Those galls are caused by root aphids, and
they, over the long haul, can debilitate a crab, and make it more
susceptible to any other disease. I would bare-root the tree and
carefully wash between the nodules, using a Q-tip to get into cracks. But
of course use your judgement: if your trees are likely to be more stressed
by the bare-rooting than by the aphids, leave them be. The aphids attack
the roots of crabapples and the foliage of elms, so be alert if you have
elms.


Kevin,
I had a number of apple trees that were collected, about 45 years of age
and
they had the nodules on the roots. I never had one die or even suffer from
the disease. In fact, the appearance of the surface roots was so good I
tried to introduce it to other apples!
Jerry Meislik

Nina

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I have many Crab apples that have been grown from seed over the past 15
years. Some are now starting to thicken up and a couple are flowering.
Some of the best shaped ones have developed crown gall.

That's what I get for starting at the *end* of a thread. Are you sure
this is crown gall? I don't know the situation in Wales; in the US galls
on apple roots are often caused by root aphids. Crown gall isn't common,
and isn't easily spread in a bonsai-situation (you'll want to sterilize
your pruning tools after use, however!). If I had a tree with crown-gall,
I wouldn't worry about it, but if I lived next to a commercial orchard,
I'd call Cooperative Extension and get their opinion on whether I needed
to take precautions as a good neighbor.

Folks in the US should look for root aphids, though.

Nina

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Nina,
My impression was that the parasite causing the galls was a nematode. See
http://plant-disease.ippc.orst.edu/a...m?article_id=1
In any case your suggestions on caution are well advised, but to not belabor
the point the disease did not seem to harm the apple bonsai which I had and
were collected with it over a period of over ten years.
Jerry Meislik
Whitefish Montana USA
Zone 4-5
http://www.bonsaihunk.8m.com/
Well, that's not a good idea. Those galls are caused by root aphids, and
they, over the long haul, can debilitate a crab, and make it more
susceptible to any other disease. I would bare-root the tree and
carefully wash between the nodules, using a Q-tip to get into cracks. But
of course use your judgement: if your trees are likely to be more stressed
by the bare-rooting than by the aphids, leave them be. The aphids attack
the roots of crabapples and the foliage of elms, so be alert if you have
elms.


Kevin,
I had a number of apple trees that were collected, about 45 years of age
and
they had the nodules on the roots. I never had one die or even suffer from
the disease. In fact, the appearance of the surface roots was so good I
tried to introduce it to other apples!
Jerry Meislik

Nina


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Nina,
My impression was that the parasite causing the galls was a nematode. See
http://plant-disease.ippc.orst.edu/a...m?article_id=1
In any case your suggestions on caution are well advised, but to not belabor
the point the disease did not seem to harm the apple bonsai which I had and
were collected with it over a period of over ten years.
Jerry Meislik
Whitefish Montana USA
Zone 4-5
http://www.bonsaihunk.8m.com/
Well, that's not a good idea. Those galls are caused by root aphids, and
they, over the long haul, can debilitate a crab, and make it more
susceptible to any other disease. I would bare-root the tree and
carefully wash between the nodules, using a Q-tip to get into cracks. But
of course use your judgement: if your trees are likely to be more stressed
by the bare-rooting than by the aphids, leave them be. The aphids attack
the roots of crabapples and the foliage of elms, so be alert if you have
elms.


Kevin,
I had a number of apple trees that were collected, about 45 years of age
and
they had the nodules on the roots. I never had one die or even suffer from
the disease. In fact, the appearance of the surface roots was so good I
tried to introduce it to other apples!
Jerry Meislik

Nina


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Nina,
My impression was that the parasite causing the galls was a nematode. See
http://plant-disease.ippc.orst.edu/a...m?article_id=1

But gall nematodes are not found on apple. People like to blame nematodes
for a lot, but I have to pick a gall apart and find the nematode, then key
it out before I believe it. Whereas, I see root aphids on crabapple
bonsai all the time.

Nina.

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I have come across Rust on my Hawthorns and Junipers sometime back. They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rust usually affects
apples, but I was lucky

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I have come across Rust on my Hawthorns and Junipers sometime back. They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rust usually affects
apples, but I was lucky

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++++Sponsored, in part, by Ken Rutledge++++
************************************************** ******************************
-- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ --
+++++ Questions? Help? e-mail +++++

I have come across Rust on my Hawthorns and Junipers sometime back.They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rusr usually affects
apples, but I was lucky

************************************************** ******************************
++++Sponsored, in part, by Ken Rutledge++++
************************************************** ******************************
-- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ --
+++++ Questions? Help? e-mail +++++

I have come across Rust on my Hawthorns and Junipers sometime back.They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rusr usually affects
apples, but I was lucky

************************************************** ******************************
++++Sponsored, in part, by Ken Rutledge++++
************************************************** ******************************
-- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ --
+++++ Questions? Help? e-mail +++++

I have come across Rust on my Hawthorns and Junipers sometime back. They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rust usually affects
apples, but I was lucky

************************************************** ******************************
++++Sponsored, in part, by Ken Rutledge++++
************************************************** ******************************
-- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ --
+++++ Questions? Help? e-mail +++++

I have come across Rust on my Hawthorns and Junipers sometime back. They
appear as galls. I had to keep my Hawthorns away from all my other trees to
prevent it spreading. I eventually dumped all the Hawthorns. Rust usually affects
apples, but I was lucky

************************************************** ******************************
++++Sponsored, in part, by Ken Rutledge++++
************************************************** ******************************
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+++++ Questions? Help? e-mail +++++