Red Tinge on Green Maples?

node

Hi all,
maybe you can help me.

Two of my maples, a Acer Palmatum Katsura as well as regular green Dissectum have started to get a reddish tinge on their leaves and stems, as well as minute pinprick like black spots on some leaves.

I've ruled out insect pests, as well as leaf burn, (first part of april in Europe not that many sunny days yet) but was wondering wether it might be some fungal infection.

All plants are potted, there has been no frostdamage. The weather has been rather wet and cold lately, Temps between 5ºC and 18ºC at best. A couple of sunny days.

At the spot they are standing they get no more than 4 hours of Sun a day.

Other maples I have (atropurpureum,atrop dissect, Deshojo, Sode Nishiki, etc.) have not shown any signs of disease or infection.

Maybe you can help me lay my worries to rest.
I've inclosed various pictures.

greetings,

node

Attached (Images of Acer Palm. Katsura - Damaged Leaves vs. Healthy Leaves)

Attached Images

	Acer_Katsura_DAMAGED_LEAVES_02.jpg (53.3 KB, 28 views)
	Acer_Katsura_DAMAGED_LEAVES_01.jpg (63.5 KB, 16 views)
	Acer_Katsura_DAMAGES_LEAVES_05.jpg (43.3 KB, 31 views)
	Acer_Katsura_HEALTHY_LEAVES_01.jpg (55.6 KB, 11 views)
	Acer_Katsura_TOP_01.jpg (70.9 KB, 27 views)

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Attached (Images of Acer Palm. Dissectum - Damaged Leaves and Reddish Tinge)

Attached Images

	Acer_Dissectum_DETAIL_02.jpg (57.9 KB, 13 views)
	Acer_Dissectum_DETAIL_01.jpg (53.3 KB, 13 views)
	Acer_Dissectum_FULL_01.jpg (64.9 KB, 9 views)
	Acer_Dissectum_LEAVES_01.jpg (59.9 KB, 14 views)
	Acer_Dissectum_LEAVES_02.jpg (61.6 KB, 18 views)

__________________
Whenever you find that you are on the side of the majority, it is time to reform. - Mark Twain
Never let your sense of morals get in the way of doing what's right. - Isaak Asimov
The most savage controversies are those about matters as to which there is no good evidence either way. - Bertrand Russell

Carl_Bergstrom

Hello node,

I haven't seen this particular problem first-hand, so my feedback is of limited use.

Still, I'd like to ask: is it possible that these trees have been over-fertilized?

Best regards,
Carl

node

They have been fertalized recently that is true.

I have used Blood & Bonemeal, but not really in great amounts I thought.
I admit to being new at using those products as fertalizers, as I only recently switched to organic stuff, but that was the reason why I was trying to be very careful with the respective amounts.

If it really turns out to be over-fertilization I know what to do, trickle water through the pot for 24-48h, but I'm not totally convinced yet.

Can anybody confirm this or knows something else it could be?

node

Attached: another closeup of the Katsura, this time of a damaged leaf underside.

Attached Images

Acer_Katsura_DAMAGED_LEAVES_06.jpg (48.2 KB, 24 views)

__________________
Whenever you find that you are on the side of the majority, it is time to reform. - Mark Twain
Never let your sense of morals get in the way of doing what's right. - Isaak Asimov
The most savage controversies are those about matters as to which there is no good evidence either way. - Bertrand Russell

Carl_Bergstrom

Unless you really caked on the bone/bloodmeal, overfertilization sounds unlikely.

Cheers,
Carl

node

...only a light sprinkling, and other acers that consistantly got the same treatment do not appear to show any symptoms at all, Bonsai or plant.

I'm just trying to find out what's wrong at an early stage, so I can still do something about it. I didn't really feel like waiting another couple of weeks before posting in "Dying Bonsai"...

__________________
Whenever you find that you are on the side of the majority, it is time to reform. - Mark Twain
Never let your sense of morals get in the way of doing what's right. - Isaak Asimov
The most savage controversies are those about matters as to which there is no good evidence either way. - Bertrand Russell

rowan57

Again, i am not sure as i havent seen this problem first hand, but possibly they are staying too wet? The underside of the leaf made me think that because it kinda of looks like its rotted or something. Another possibility is windburn which maples do get very easily, are they in a sheltered or windy position?

Regards
Rowan

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node

The plants are screened from strong winds and haven't had all that much chance to get a bit of sun due to the poor weather here lately. It has been cold and wet, no frost though.

Would overwatering cause this reddish color?

__________________
Whenever you find that you are on the side of the majority, it is time to reform. - Mark Twain
Never let your sense of morals get in the way of doing what's right. - Isaak Asimov
The most savage controversies are those about matters as to which there is no good evidence either way. - Bertrand Russell

rowan57

I couldnt be sure, but its definitely another option i would look into.

Regards
Rowan

__________________
In literary and art criticism there are two criteria, the political and the artistic....

Words and actions should help to unite, and not divide, the people of our various nationalities

I often talk to myself because i am the only one who truly understands me.