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Maple Forums on the UBC web-site

Japanese maple dead branches and discolored bark

UBC Maple Forum - Sat, 19/08/2017 - 22:19
Love the forum. We just moved into our home in Fort Worth, TX where we have a beautiful Japanese Maple situated on our North wall. It is well established, with large, strong roots, gets partial sunlight in the AM, full sunlight in heat of day, and gets some evening shade.

We noticed a few weeks back that one branch's leaves curled up and never opened fully. Meanwhile, dead branches seem to be propagating at an alarming rate, with nearly 1/3 of the established branches bare and showing...

Japanese maple dead branches and discolored bark

Fun seedlings

UBC Maple Forum - Sat, 19/08/2017 - 12:37
So who's got any interesting seedlings to look at?

Here are a few of mine.

The first 4 are of a dwarf form that stays a great chocolate brown for weeks, with tightly rolled leaves, before turning a dark almost bluish green. This one is 5 years old but somehow I've not gotten pictures of it before. The parent is 'Green Star'.

Next is a seedling from 'Villa Tarranto' that has not made the usual strap leaf, instead looking almost dissected.

A seedling of 'Heiwa' has red and green...

Fun seedlings

Maples from a park

UBC Maple Forum - Tue, 15/08/2017 - 17:31
Went for a walk between two showers of rain, and spotted a couple of maples.

There was a buergerianum in a hedge, very surprising to find one there although this species that was totally absent not so long ago even in parks is now found as street trees, or in big containers in a pedestrian area of the city centre.

There's also an Acer triflorum, almost certain about that, the leaves are almost identical to an A. griseum that I have at home, but the bark is greyish and doesn't peel off:...

Maples from a park

Princeton Golden maple

UBC Maple Forum - Mon, 14/08/2017 - 20:47
I planted my golden maple 2 years ago - about 10 ft tall. I put fertilizer in hole before I planted it. I live in a 5 a-b zone, alkaline soil. Last year it was beautiful. But this spring (not sure if due to harsh winter or early buds freezing) but there is leaves only on one branch of the tree. I applied a high nitrogen fertilizer. The tree branches all still have sap in them, not dead. This is mid august. It is planted in a sunny location. Should I move it this fall?

Japanese Maple Tree ID

UBC Maple Forum - Mon, 07/08/2017 - 16:34
Hi,

I am a new member of the forum. Can anyone tell me what Japanese Maple cultivar this is?
  • The first seven photos were taken in April
  • The last four photos were taken in June
I have photos that I will post next which were taken in July and August.

Thanks for your assistance.

copper and bacterial infections

UBC Maple Forum - Sat, 05/08/2017 - 09:27
One of the most common maple questions is what to do about black spots that appear in the late winter and early spring.
These are usually bacterial infections in the bark, often caused by the pseudomonas vv. bacteria, which has the interesting property of lowering water temperatures just enough to cause ice nucleation on the bark surface. This causes tiny splits in the bark through which the bacteria is able to enter and cause an infection.

When the temperature is swinging through the...

copper and bacterial infections

Arboriculture Video Series

UBC Maple Forum - Fri, 28/07/2017 - 22:43
Arboriculture Video Series
(Great insight into all topics. Many real life cases following a tree over several years to show impact)
Instructional videos - Edward F. Gilman - UF/IFAS

Tree mechanics and structure


Arboriculture Video Series

Weird (to me) leaves on Autumn Moon

UBC Maple Forum - Fri, 28/07/2017 - 01:33
This is my first year with an Autumn Moon that I bought in September. All the leaves have turned a chartreuse green except for two which are red on a lower branch. It's a small branch which has two sub-branches, one with several green leaves and one with the two red ones. What's the deal?

Acer p. 'Higasayama'

UBC Maple Forum - Tue, 25/07/2017 - 21:48
My 'Higasayama' started the year beautifully, but has now sprouted lots of larger plain green leaves, which are overwhelming the variegated leaves. I know this can happen when 'Higasayama' is treated too kindly(!), and I suspect mine needs more sun (I haven't repotted it this year).

The question is, what do I do now to get my 'Higasayama back? If I leave it, will it simply revert to the normal leaves next year? Or do I need to painstakingly remove all the rogue leaves now to allow...

Acer p. 'Higasayama'

Cold hardiness of Japanese maples

UBC Maple Forum - Tue, 25/07/2017 - 17:17
I've been searching the forum for hard information on this subject -- ideally from gardeners speaking from their own hands-on experience in colder climate zones -- and find that the data pool is limited, to say the least. One finds assertions to the effect that "XXX is not hardy beyond zone 6," but these seem to come mostly from books or from gardeners in warmer climates. (And I mean no disrespect to these kind gardeners who are trying to be as helpful as they can.)

I wonder, though,...

Cold hardiness of Japanese maples

Acer spicatum

UBC Maple Forum - Fri, 21/07/2017 - 19:01
Here are a few pictures of a neat species that I rarely get to see. I took these in the mountains of western North Carolina at about 5200' (1585 meters) elevation.

In-depth information on select maples

UBC Maple Forum - Fri, 21/07/2017 - 15:55
Here is a great resource on hardwood trees including maples.
https://www.na.fs.fed.us/spfo/pubs/silvics_manual/volume_2/vol2_Table_of_contents.htm
The information provided is in-depth and covers a wide range; including range of native habitat, growth conditions/ climate, seed germination methods/ reproduction, and damaging agents/ pests & disease.

Acer Maple
Acer...

In-depth information on select maples

Maples that are proven performers

UBC Maple Forum - Tue, 18/07/2017 - 07:02
I've collected around 40 varieties of Japanese Maples so far, and I've noticed that some varieties are vigorous and healthy while others just stagnate and fail to perform or live up to the hype. Unfortunately it seems the world is bloated with many cultivars that probably should have never been given a name in the first place, or are mere collector's curiosities. I'm tired of spending money on trees only to be disappointed. I want to see mature specimens in my lifetime. Before I go...

Maples that are proven performers

Verticillium wilt

UBC Maple Forum - Wed, 12/07/2017 - 19:55
Here is complete and extensive information on Verticillium wilt:
Verticillium wilt

For those looking for condensed information or other disease information specific to maples, I recommend checking out the maple resources page or this information:
Maple Diseases (Plant Diseases)

The condensed...

Verticillium wilt

Bacterial Leaf Scorch

UBC Maple Forum - Wed, 12/07/2017 - 15:14
Here is a link to extensive information on Bacterial Leaf Scorch (BLS).
Bacterial leaf scorch (BLS) of shade trees
Those in the Midwest to the Gulf states should take notice that leaf hoppers spread BLS. I know from personal experience when leaf hoppers gave BLS to my 'Goshiki shidare.'

For those looking for condensed information on BLS or other disease, I recommend checking out the maple...

Bacterial Leaf Scorch

Does this look like a possible Pseudomona?

UBC Maple Forum - Sun, 09/07/2017 - 03:30
Noticed these black spots on my 'Seiun kaku' about 4 days ago. We've had a very wet spring and early summer, and the media the tree is in is less than ideal. The two small branches have since been pruned out. Is there anything else I can/should do?

Thanks,
Kyle

Anyone in US grafting?

UBC Maple Forum - Tue, 04/07/2017 - 17:47
I have a delightful seed-grown Japanese maple that seems to have excellent cold hardiness It is probably 6 or 7 years old now. I had many seed sources and did not keep things separated so this might be palmatum or shirasawanum or japonicum.

It survived a late transplant to Iowa City from southern IA (Mid November 2013). The 13/14 winter was bitterly cold with a low temperature of -19F. The tree had no die-back.

It seems to be a vigorous upright 4 feet of growth last year. The leaves are...

Anyone in US grafting?

Ten Steps to Disease-Free Growing

UBC Maple Forum - Tue, 27/06/2017 - 15:05
A list of 10 steps (with detailed explanations) to successful greenhouse propagation (by reducing risk of diseases and pests).

[PDF]
Ten Basic Steps to Less Disease in Your Crop
By: Dr. Steve Nameth
Department of Plant Pathology
The Ohio State University

"Quick Reference Table: Ten Steps to Disease-Free Growing
1. Always start with disease-free seed, cuttings, and propagation
material.
2. Grow disease resistant crops, if possible.(...too late...

Ten Steps to Disease-Free Growing

Deficiency guide

UBC Maple Forum - Mon, 26/06/2017 - 18:50
When looking for info on fertilizers and plant deficiencies, I came across this page:

CANNA CANADA

It's from the website of a private company selling fertilizers, but it's very clear and well illustrated. I thought it could be of some help for those who encounter leaf pbs with their trees.

Et il y a une version française:

Croissante d'informations pour la culture plantes | CANNA France...

Deficiency guide

Eikando Zenrin-ji in Kyoto

UBC Maple Forum - Sun, 25/06/2017 - 00:03
Eikando is along the philosopher's path between Ginkaku-ji and Nanzen-ji, two temples we planned to visit. It turned out to be one of our favorite places in Kyoto, with the widest range of maples we saw anywhere (outside of the botanical garden, anyway) and really a fantastic (in the true sense of the word) architecture.

So I took a lot of pictures, both of maple and garden interest, as usual in the order of our visit. This first group features maples and gardens.

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