Withered new shoots on a healthy Japanese Maple

[ajm55555]

I wonder if anyone has ever experienced something like this. The new shoots on my Japanese Maple that came out in mid June were healthy and growing fast at the beginning. Since a few days they look withered and do not recover during the night. On the other hand the first leaves from Spring look fine and hydrated.
Today I cut them but you can still see some new leaves.
The plant takes sun from late morning to early afternoon from the top (not directly on the pot).
Could it be that the younger leaves on this species (Deshojo) are very sensitive to direct sun light?
Could it be the fertilizer? I don't think it got too much but the moss went brown lately.
Do you have any idea?

 

[Timber]

I would say the hot summer sun. I've found that any new growth during summer months seems to get withered in direct sun.

 

[Brian Van Fleet]

Looks like it dried out on you briefly at some point recently. New foliage is more susceptible and responds like this.
Chemical ferts contain salts, if you're using them in a too-heavy concentration, it can have the same "drying" effect.

 

[ajm55555]

Thanks for your thoughts. I'm happy to hear the plant itself should not be in danger.
I'll skip fertilizing it for a while, then dilute it more and I'll keep it in a more shady place.

 

[MACH5]

Don't worry about it. And as Brian said careful with the chemical fertilizers. It has happened to me as well.

 

[aml1014]

Don't worry about it. And as Brian said careful with the chemical fertilizers. It has happened to me as well.

This may be the reason for my only JBP demize healthy 2 weeks ago pushing new needles, now it's wilty and pale green.
Now I know for my next one.

Aaron

 

[Cypress187]

This bonsai stuff is hard man.

 

[MACH5]

This bonsai stuff is hard man.

... and designing a tree well is even harder!

 

[ajm55555]

Don't worry about it. And as Brian said careful with the chemical fertilizers. It has happened to me as well.

Thanks Sergio and everyone!

 

[ConorDash]

I don't think it's much to worry about, good watering and normal routine of fert like these guys mentioned.

Could be worse, could be my leaves.

 

[Cypress187]

Could be worse, could be my leaves.

That's how mine looked just before it died

 

[ConorDash]

That's how mine looked just before it died

Thats not even funny lol.. Its really not!

If I hadn't already made a topic and had pages of conversations about it, I'd be so worried right now.

 

[erb.75]

Thats not even funny lol.. Its really not!

If I hadn't already made a topic and had pages of conversations about it, I'd be so worried right now.

Conor, what was the result of that thread? I have a JM that is doing that. It also has a small area on the trunk that is black, and I'm thinking/hoping it just died down to the nearest internode.

 

[ConorDash]

Conor, what was the result of that thread? I have a JM that is doing that. It also has a small area on the trunk that is black, and I'm thinking/hoping it just died down to the nearest internode.

Ill PM you, I don't wanna hijack ajm's thread.

 

[Cypress187]

Conor, what was the result of that thread? I have a JM that is doing that. It also has a small area on the trunk that is black, and I'm thinking/hoping it just died down to the nearest internode.

Mine had also a black piece of thrunk, got bigger and guess killed it. I think you need to take action, I tryed waiting and it doesn't help.

 

[Eric Group]

Mine had also a black piece of thrunk, got bigger and guess killed it. I think you need to take action, I tryed waiting and it doesn't help.

Black trunk with wilted leaves can be a sign of the dreaded verticulum wilt which is almost 100% fatal and incurable from everything I have seen and heard- Hope it is not that!

 

[MACH5]

Black trunk with wilted leaves can be a sign of the dreaded verticulum wilt which is almost 100% fatal and incurable from everything I have seen and heard- Hope it is not that!

It also can be the very similar looking pseudomonas syringae, a bacterial disease that fortunately is treatable and not necessarily fatal. I have had two cases of it and was able to treat effectively in both cases.

 

[coh]

Regarding black trunks...I've noticed that sometimes when you trim a branch (leaving no growth above it), that segment will often turn brown/black and die back down to the nearest node. If that is what is happening, it's probably OK. The big problem is when a normal, healthy segment of trunk or branch (with plenty of growth above it) starts turning black. That's what happened to my Kiyohime (in http://www.bonsainut.com/threads/maple-disease-repotting-fungicide-questions.23077/) this spring, it was some kind of infection that eventually killed the whole tree.

 

[Cypress187]

Regarding black trunks...I've noticed that sometimes when you trim a branch (leaving no growth above it), that segment will often turn brown/black and die back down to the nearest node. If that is what is happening, it's probably OK. The big problem is when a normal, healthy segment of trunk or branch (with plenty of growth above it) starts turning black. That's what happened to my Kiyohime (in http://www.bonsainut.com/threads/maple-disease-repotting-fungicide-questions.23077/) this spring, it was some kind of infection that eventually killed the whole tree.

Did it spread to other plants? I have another plant with an dark /back non-vigorous branch, I cut the entire branch / trunk off on that height just to be sure, the rest of the plant is doing very good.

 

[coh]

No, at least not yet. As I mentioned in that thread, the tree spent the winter in an enclosure with other trees, none of which have been affected. During the spring, it was out in the vicinity of other trees when I noticed the first symptoms, so far no evidence of spread.