Hawthorn leaf issue, help needed

[edprocoat]

I have seen similar on my Ficus and my apples last summer in Ohio and believe it or not there were spiders webbed inside the leaf. No red veins though, just the leaf wrapped up like it was building a home for itself.

ed

 

[JudyB]

Yes, I've seen lots of insect curled leaves. This is not the case. Where the veins turn red, thats where the curling starts, and as it spreads, the leaf curls up more and more until it's like the completely tubed one in the photo. And all the veins at that point are red.

 

[cmeg1]

It does sort of look like peach tree curl like jquasts elm.It is definitely standard procedure to remove infected leaf immediately.Peachtree curl comes from spores in the air.It can be minimized by keeping under a roof or something in early spring.

 

[JudyB]

County extension guy has never seen anything like this either, from the phone conversation I had with him. But he seems to think it could be thrips. If so, the systemic will get them, and I'm going to spray with a soap as well, to get anything left on the tree before the systemic kicks in. He also said that they would need a "branch" to do any pathology on the problem, so I won't be sending any samples in for testing. Will see what happens in the coming week.

My problem with a thrip diagnosis, is that there are no papery type sucking or chewing marks on the leaves whatsoever.

 

[iant]

It doesn't look insect like to me at all. I'd guess fungal. I had a hawthorn that had leaves go black a few yrs ago. I don't try to grow hawthorns anymore. They don't do well in my area. Even the landscape ones look bad. That's just here though. Anyway I vote fungal.
Ian

 

[GrimLore]

I am pretty certain after reading a LOT since my last post that it is fungal and called Anthracnose. Pretty certain that "red" look is the veins turning brown.

Grimmy

Edit: Forgot to mention that many fungal problems occur in Spring when it is damp. I stopped Foliar watering two seasons back and greatly reduced fungal problems.

 

[JudyB]

Actually the red is really red. Like really red. No brown overtones at all. I've seen anthracnose before, we have it here during rainy springs. This really doesn't look like that to me. These leaves do not dry out and die, they curl and stay pliable. We will see how it comes along. Thanks all for your input.

 

[crust]

My only experience with anything close to this ended up being induced by microscopic infantile insects which would abandon the leaf but induce the curling and the curling would continue even without the insect present--systemic insecticide worked best to avoid it. This curling accompanied with the redness sounds unique though...beerry stwange...

 

[sorce]

I agree with you on the University Extension. Note the picture labels are wrong. Attention to detail.


I believe it may be regular old leaf curl. Lotta talk of red.
Though, I did start thinking the red color may be dismissed due to healthy pot culture. Small things may differ being healthier.


Best to you and your Haw!

Sorce

 

[JudyB]

The thing that everyone is missing here, and that makes this a strange and hard to pin down problem, is that there is no actual LEAF discoloration. The only red is the actual veins in the leaves. As if it sucked up some dye or something. Also no actual leaf damage other than that the leaf curls. There are no spots red or brown, and no marks of damage. At least after taking all the old affected leaves off yesterday, there is no sign of any more starting to turn. We will probably never know what happened.

 

[JudyB]

Well as I had hoped, this was a short lived event. After removal of all the affected leaves, there have been no new signs of any problems, and the tree is continuing to churn out buds and new leaves. It's uptaking water at a fast rate, another sign of a healthy D tree. So I would suspect that it was the uptake of the systemic. It may have been too dry when I applied and when it got watered in, the tree sucked up a larger than normal dosage, combined with the leaves being in a more tender phase when I applied it this year. I wanted to get the systemic on a bit earlier, so as soon as leaves started to really get moving, I put it on. I will make sure that this tree is not too dry (although I'm just guessing it was) before application in future years.

Of course, it could've been some odd fungus or thrips, but none of my other trees have had any leaf issues, and they have been together until this problem started.
I'll never know, but at least it's over now. Thanks for all the time people took to help out!

 

[Cadillactaste]

Glad to hear that it's seemingly healthy and no more issues of this has come about.

 

[brewmeister83]

just bumping this thread because I may have a clue as to whats going on...
one of my haws developed this same problem this week, curled dark leaves, no leaf discoloration, but bright red veins...


There was nothing to be found on the darker curled up leaves, but on a couple of the ones that had just started to turn or were half turned I found this...


Little Fuzzy Bastard! The redness must be caused by something these things carry that infects the leaf veins as they suck. Needless to say the affected leaves have been removed and the buggies squished! By the time the veins turn completely red and the leaf curls they've already moved on, maybe that's why you couldn't find anything Judy. Hope this helps in the future

 

[JudyB]

Could be brewM. I found the same issue on a few of my landscape crabapple trees, so it was not the systemic that I had applied as I thought it might be. Hare do say that the bug was the cause, or not though, as I never saw any and looked hard. My tree is fine, now, thank goodness, so it's short lived. Pretty leaves though if it wasn't so alarming right?

 

[brewmeister83]

Could be brewM. I found the same issue on a few of my landscape crabapple trees, so it was not the systemic that I had applied as I thought it might be. Hare do say that the bug was the cause, or not though, as I never saw any and looked hard. My tree is fine, now, thank goodness, so it's short lived. Pretty leaves though if it wasn't so alarming right?

I know, if only I could find a wild cultivar that had those bright burgundy veins and deep green leaves, it would be gorgeous! I'd propagate that plant in a heartbeat!