HAWTHORN PROBLEM...HELP PLS

[August44]

My very nice Hawthorn has had this on the leaves for most of the summer. I have sprayed with different fungus sprays including Clearys 336. Doesn't seen to affect the spread of it. Any help is appreciated. Thanks!

PS: I know I ask for a lot of help on this site, but I really appreciate the help. The nearest club is 2 hrs away and no one even close to me practices this fun hobby. Hard to get any help at all locally.

 

[Paradox]

When did it start?
Really odd that it would be a fungus.
Isn't where you are normally low humidity?
Has it been humid this summer?
Could this possibly be insect damage?
Sorry I can't be more definitive.

Don't worry about asking for help.
That's one of the reasons the forum is here for.

 

[August44]

When did it start?
Really odd that it would be a fungus.
Isn't where you are normally low humidity?
Has it been humid this summer?
Could this possibly be insect damage?
Sorry I can't be more definitive.

Don't worry about asking for help.
That's one of the reasons the forum is here for.

It started in late spring. Yes we have pretty low humidity here and it has not been at all overly humid this summer. It is also in a pretty airy place, under 50% shade cloth. I will take a close look with a magnifying light and look for insects.

Thanks for the help

 

[AJL]

Difficult to pinpoint the cause from the photos!
Is the symptom still spreading?
Could it be chemical damage?
Have you had any exceptionally hot drying weather this season?
have you kept the tree exposed to drying wind or salt spray?
What does it look like on the underside of the leaves eg has the lower leaf surface been damaged/eaten?
Any rusty spots/pustules?

 

[Lutonian]

It could be fungus or more likely the care or environment its has received, I keep mine in full sun with good airflow this will help reduce the chance of things like grey mould, leaf spot ect.

where is it being kept, what is the soil like and what are your water habits like, photos of the area the tree is in and the soil might help with the diagnosis.

 

[Lutonian]

some usa based general pest information

Why Your Tree's Leaves Are Turning Brown in Summer (and How to Fix It)

No, autumn didn't come early this year. Here's how to fix the real problem.

www.bhg.com

https://ecommons.cornell.edu/bitstream/handle/1813/60585/BranchingOut_Hawthorn6-17.pdf?sequence=1&isAllowed=y

Hawthorn: Leaf spot | Hortsense | Washington State University

hortsense.cahnrs.wsu.edu

Common Insect Pests of Hawthorn

http://plantclinic.cornell.edu/factsheets/hawthornleafblight.pdf

 

[Kanorin]

The leaves look otherwise quite healthy. I wouldn’t go nuclear on it unless it seems to be progressing. Keep up with preventative fungicide treatments though as cedar hawthorn rust seems very quick to pop up if I lapse on mine.

 

[rockm]

It could be rust--Cedar/Hawthorn rust is just as prevalent as cedar/apple rust. Hawthorn is in the apple family and is susceptible to the same fungal attacks. If there are juniper or apple trees around, they could be contributing to your problem.

https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/rusts/cedar-hawthorn-rust

 

[penumbra]

Your hawthorn looks better than most of mine. Mine have rust and with all the cedar around me it is not surprising. I spray, but not enough, so it comes and goes. My crabs are surprisingly clean. I should give up on hawthorn but I am not ready to throw in the towel.

 

[Javaman4373]

I have 5 hawthorns I collected this spring and one of them has white lesions on a few leaves. I haven't a clue what it is. It has been very wet here this summer, 10.4 inches of rain in July and another 0.83 last night. I think the affected hawthorn is a different species from the others. The only treatment I have given that tree is an insecticide spray for some aphids on the new growth. If a leaf has been severely affected, I have just plucked them off. The lesions are not friable and don't rub off. We do have a lot of apples and crab apples near by and very few cedars quite a distance away. I will go check out the hawthorns in the landscape to see if they show anything similar when I get a chance. Here are what these lesions look like, they are mostly on the underside of the leaves..

 

[Deep Sea Diver]

Hawthorns can be persnickety, prone to various and sundry viruses, funguses etc. My go to is to use copper fungicide on a monthly basis during the growing year and 3 times in winter. Don’t spray the media, avoid washing the leaves for a couple days afterwards and keep the trees in part sun.

I think it’s important to recall the damage, once created, will not get better, but if effective the new leaves should come out looking green.
cheers
DSD sends

 

[August44]

Hawthorns can be persnickety, prone to various and sundry viruses, funguses etc. My go to is to use copper fungicide on a monthly basis during the growing year and 3 times in winter. Don’t spray the media, avoid washing the leaves for a couple days afterwards and keep the trees in part sun.

I think it’s important to recall the damage, once created, will not get better, but if effective the new leaves should come out looking green.
cheers
DSD sends

Thank for input. What does outlined red mean pls. Shall I remove all affected leaves?

 

[Deep Sea Diver]

Thank for input. What does outlined red mean pls. Shall I remove all affected leaves?

Some folks do this. I do the worst and watch the others for spreading issues.

One important item… One pathogen spreads between junipers, cedars and hawthorns, so keep the hawthorns (and crabapples) away from these trees.

…other items that may be helpful.

Be sure to spray when buds form

As a general practice on all trees, be sure last watering of the day is done so there is time for the leaves and needles of your trees to dry before dark.

Clean up all detritus of the media of your trees and the benches.

Cheers
DSD sends

 

[Deep Sea Diver]

Lastly look for these guys

Hawthorn insects

I have had this hawthorn 4-5 years, it has been doing fair, as it has not dies on me. The branches don't seem to be getting any larger, but I figure as long as it is living maybe they will grow. We had rain most everyday last week, most at end of day when I got home. Did not need to water, but...

www.bonsainut.com

Good luck!
DSD sends