Blk. Spot on Ch. Elms - What It Looks Like

Thomas_J.

Soon if not already, many people and especialy beginners who work with ch. elms in their collection, will start seeing changes in the leaves on their trees.
Almost all who have worked with these trees for a while have heard of the dreaded "Black Spot" that can over take them in no time. Just because your leaves are looking a little different at times on these trees doesn't mean you have blk. spot, especially if the leaves are older and more mature.

In my experience with these trees, blk spot will only affect new tender growth, and that's why you will mainly see this problem in the Spring and early Summer.

Here's a picture of what blk. spot looks like. If your leaves don't look like this, then you probably have something else going on. A couple of leaves on your tree like I found this morning on mine will not hurt the tree. It would be a good idea though to cut them off immediately and inspect the tree overall.
If your not in the habbit of routinely checking your trees, you might find that it has over taken the tree, and then you have problems.

Hope not too many of you find your trees with leaves that look like this one.

Attached Images

blk spot.jpg (28.0 KB, 83 views)

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Thomas J.

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Ralph

Hey,

Tom, thanks for that Pic. This is very reassuring.

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Emerging from winter slumber
Bonsai trees burst buds anew
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BonsaiGreenhorn

Thanks for this thread Thomas, this is also very reassuring for me also after talking to you over PM's. This will also help future Chinese Elm questions i'm guessing!

Thanks
-Evan

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jloeschner

Thank you. Your pic confirms what I suspected. One of my poor trees is having a rough time with this. I am using a Schultz brand fungicide, but it doesn't seem to be helping much. I plan on giving the stuff one more week (it's been two...), and then I plan on trying something else. According to the directions, I should spray the tree once every 7 days until the problem goes away. At this rate, the problem will go away when all of the tree's leaves go away. Very frustrating. Of course, it doesn't help that it rains every other day or two. I hate to bring the tree inside, but I may end up having no choice.

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Thomas_J.

jloeschner,
If you don't start seeing an improvement real soon, start using Daconil, and by all means get them out of the rain from here on. No more watering from above until the leaves have hardened up.

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Thomas J.

jloeschner

Thomas,

Thanks for the advice. I went ahead and brought the tree inside to keep it out of the rain. I also trimmed all of the infected leaves/branchlets off (again). I will also start watering by submerging until it improves or dies. Hopefully, it will recover.

BTW, would you have any idea where one could get Daconil? Is it a brand, or ingredient?

Regards,
John

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Good judgement comes from experience. Experience comes from bad judgement.

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BonsaiGreenhorn

I also have this question incase I ever get black spot.
thx
-Evan

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Bart Thomas(deceased)

Daconil is a brand (Made by Ortho). Available at most garden centers.

Thomas_J.

jloeschner,
The submerging method might not be a good idea especially with ch. elms.
They tend to yellow their leaves real fast if too wet. Your normal watering from just above the rim of the pot will do.

I try never to submerge any of my trees unless it's an emergency, which so far I haven't had.

And as Bart Thomas said, Daconil is a brand name and can be found either under that name, or made by a company with a different name but listing Daconil as it's main ingredient. The stuff is really easy to find, even at Wal Mart.

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Thomas J.