Some growing tips have dry out and leaves are deformed on Elm

[proninyaroslav]

About a week ago I noticed that some of the growing tips had become sluggish and dried out (about 25% or less). I thought it was after applying the fertilizer, maybe I forgot to water the dry soil before (I noticed this the next day after applying the fertilizer).



After a week, there are no new died growing tips, but some young leaves have become deformed and changed color. Does this look like some kind of disease? Or maybe exposure to cold? There are no visible pests on the leaves. I made two preventative fungicide treatments before and after leafing out. I had a similar deformation of the leaves last year, it went away on its own, but the growing tips didn't dry out.

 

[Bonsai Nut]

Check for insects - particularly aphids or small fly nymphs. I get them in the spring and only on Chinese elms and only on new buds. You can trim off the affected leaves and the tree will recover completely. It is interesting that they don't bother American elm or English elm, which I have located within touching distance of the Chinese elms.

 

[proninyaroslav]

particularly aphids or small fly nymphs

It's definitely not aphids, there are no visible insects.

 

[proninyaroslav]

The leaves at the ends of the branches began to turn yellow unevenly and they fall off when touched. There are no visible insetcs. Maybe a deficiency of some microelement?

 

[Paradox]

The leaves at the ends of the branches began to turn yellow unevenly and they fall off when touched. There are no visible insetcs. Maybe a deficiency of some microelement?

Where in the world are you located? Can you please update your profile with that information?
It could be relevant to your problem and will give us a better idea on how to help/advise you.
Also, we can see it and not have to repeatedly ask you. Just your city/state is fine for a general area.

Again, not knowing where you are.....but Ill ask this. EDIT: I see you are zone 5A which is typically colder than I am here in zone 7
Has it been cold or have you had frost warnings?
This could be frost damage or if no frost, a cold wind can damage new leaves.
I get this kind of thing in my area. Sometimes in spring, we have dry days (ie low humidity) with cold temperatures and wind.
It can cause this kind of damage to new leaves that havent had a chance to harden yet.

 

[proninyaroslav]

I see you are zone 5A which is typically colder than I am here in zone 7
Has it been cold or have you had frost warnings?

Last month was very warm, up to +30C, the trees grew quickly, but this month is quite cold. There were even frosts at night; during the day it dropped to +10С. At night I protected it in a cold greenhouse, it's several degrees warmer there.
P.S: Location - Russia

 

[Paradox]

Last month was very warm, up to +30C, the trees grew quickly, but this month is quite cold. There were even frosts at night; during the day it dropped to +10С. At night I protected it in a cold greenhouse, it's several degrees warmer there.
P.S: Location - Russia

It's possible the drop to those colder temperatures caused it if you had it outside, and it was windy as is typical for this time of year (at least here).

It's also possibly fungal or a mineral deficiency but all the other leaves look fine so I kind of doubt that is the case.

Nice to have you here. Again, if you don't mind, please put your location on your profile. There is a spot for it. It really does help us give you the best advice. I try to consider climate/weather differences between where I am and where the person I am talking to is. It can make a big difference.

I understand why you might be reluctant....
We don't discriminate due to political/geopolitical differences here and most of us try avoid those discussions.

We have people from all over the world as members. All of us are here to share a common love for little trees in pots.

Also, I really like your avatar picture, did you create it?

 

[proninyaroslav]

It's also possibly fungal but or a mineral deficiency but all the other leaves look fine so I kind of doubt that is the case.

I have Pyracantha (Firethorn) and this year its symptoms are similar to calcium deficiency. This reflects on young leaves at the tip. I got the idea that Elm also suffers from calcium deficiency. But it's difficult to understand what the tree is suffering from. A local agronomist said that the drying of the growing tip is associated with hypothermia. And yellowing of the leaves is also possible, but he is not 100% sure.

Also, I really like your avatar picture, did you create it?

Played with an AI

 

[proninyaroslav]

After a week. Although new growth is noticeable on strong shoots, I still decided to treat it with a fungicide (yesterday). The weather has become warmer.

 

[leatherback]

Looks very much like too much fertilizer.

 

[proninyaroslav]

In real life the leaves are a little more yellow than in the photo.

Looks very much like too much fertilizer

But why is this reflected not on old leaves, but on young ones?

 

[proninyaroslav]

Looks like anthracnose. What will be effective, mancozeb or thiophanate-methyl?

 

[Paradox]

Looks like anthracnose. What will be effective, mancozeb or thiophanate-methyl?

What do the product labels say?
Should list if it treats that.
I am not remembering atm

 

[proninyaroslav]

What do the product labels say?

The product with Thiophanate states that it cures anthracnose, but the Mancozeb doesn't. I have seen here on the forum and read some articles that Mancozeb also helps cure anthracnose, but probably only in the early stages.
P.S: Mancozeb was also recommended to me by a gardener friend, but I decided to gather more information about Mancozeb.

 

[Paradox]

The product with Thiophanate states that it cures anthracnose, but the Mancozeb doesn't. I have seen here on the forum and read some articles that Mancozeb also helps cure anthracnose, but probably only in the early stages.
P.S: Mancozeb was also recommended to me by a gardener friend, but I decided to gather more information about Mancozeb.

I think Bonsai Nut recommended Thiophanate in the other thread.

 

[proninyaroslav]

I think Bonsai Nut recommended Thiophanate in the other thread.

Yes,I think I'll try that first. I used it to cure quite severe fungal diseases.

 

[proninyaroslav]

The fungicide seems to have worked, the leaves are no longer falling and there are no dry spots. But strange yellowish spots still appear, similar to human vitiligo