Plant Pathologists HELP!

[milehigh_7]

Never in my life have I had something like this that was so difficult to treat. I used Daconil and it pretty much went away then came back with a vengeance. Any great ideas on specifically what it is and even better how to treat it? I am thinking a systemic and a foliar treatment are needed but I am really at a loss. This is new territory for me. We don't deal with fungus much here for obvious reasons. Anyway, I am panicking just a bit.

 

[Deep Sea Diver]

The clearly defined lines makes it look an awful lot like too little water, too much fertilizer, or root rot damage in any order…

Best
DSD sends

 

[Wires_Guy_wires]

Is there a chance a dog peed on it?

 

[milehigh_7]

The clearly defined lines makes it look an awful lot like too little water, too much fertilizer, or root rot damage in any order…

Best
DSD sends

Strange though, I did not fertilize all summer...

 

[milehigh_7]

Is there a chance a dog peed on it?

Not much of one unless my dachshunds got a stepladder lol. Don’t get me wrong they totally would do it, on purpose even.

 

[Wires_Guy_wires]

Not much of one unless my dachshunds got a stepladder lol. Don’t get me wrong they totally would do it, on purpose even.

Alright. Because when I look at the picture, I can essentially see a pattern from leaf to leaf. That makes me think it's not the plant itself but something external.
Now if every leaf would have the same amount of black or a somewhat random distribution, I would have thought it would be something internal. But this doesn't look random enough for me.

 

[milehigh_7]

Alright. Because when I look at the picture, I can essentially see a pattern from leaf to leaf. That makes me think it's not the plant itself but something external.
Now if every leaf would have the same amount of black or a somewhat random distribution, I would have thought it would be something internal. But this doesn't look random enough for me.



View attachment 518000

It's really strange... Thanks for taking another look.

 

[Esolin]

Could it be wind/heat/cold burn? Has the weather been weird just prior to the two times it happened? I had a plumeria get damaged mostly on one side during the winter, and I could only assume it was environmental--the side facing away from the house got colder because of wind chill, and those branches died. Didn't happen the year before, so it was something specific about the weather conditions that week. Just a thought.

 

[Cruiser]

What species is that?

 

[Bonsai Nut]

I would check the roots. It looks to me like it is drying out - from the bottom of the plant to the branch tips.

 

[milehigh_7]

I would check the roots. It looks to me like it is drying out - from the bottom of the plant to the branch tips.

I’ll check

 

[milehigh_7]

What species is that?

Vitex agnus-castus

 

[milehigh_7]

Could it be wind/heat/cold burn? Has the weather been weird just prior to the two times it happened? I had a plumeria get damaged mostly on one side during the winter, and I could only assume it was environmental--the side facing away from the house got colder because of wind chill, and those branches died. Didn't happen the year before, so it was something specific about the weather conditions that week. Just a thought.

I mean it really could be heat damage to the roots. We had lots of 120+ but this species normally takes heat like a champ.

 

[milehigh_7]

Guys correct me if I’m off base but I just thought of something. I have a small dish of cuttings that are not showing the same thing. If it were a biotic (viral/fungal/bacterial) disorder it would be showing in the cuttings. Or so I’m thinking. The second image show the cutting already showing the cork bark.

 

[Cruiser]

Is the sick tree in the ground? If so how’s the drainage and what’s the watering situation?

What I’m reading says they like drier conditions and problems are caused from excess moisture.

 

[Deep Sea Diver]

I mean it really could be heat damage to the roots. We had lots of 120+ but this species normally takes heat like a champ.

Decidedly too high temperatures. Even the Sagauros were getting impacted.

The line patterns on the leaves are clear. Only other things I’ve ever seen that look like that pattern are root damage (usually caused by ferts burn) so the roots can’t uptake properly and finallyfreeze damage

Best
DSD sends

 

[nuttiest]

Have you ever put your hand on those marble stones in the summer - like 150 degrees! With the angle of sun changing maybe your shade trees are casting shade more north now, creating new/different full sun areas.

 

[milehigh_7]

Is the sick tree in the ground? If so how’s the drainage and what’s the watering situation?

What I’m reading says they like drier conditions and problems are caused from excess moisture.

It’s in a pot. Funny thing is I’ve had dozens of these and normally when they get dry they wilt just a little then snap back when watered. Not this time…

 

[Cruiser]

It’s in a pot. Funny thing is I’ve had dozens of these and normally when they get dry they wilt just a little then snap back when watered. Not this time…

So it’s just this one plant?
If the others are in a similar medium and getting similar sun exposure and water then it does make you wonder…

In the first photo there appears to be a white fuzz/speckles on some leaves. Is that natural to the plant? Is your tree positioned next to a clothes dryer vent?

Could we please get closeup pictures of the fuzz, undersides of the dead leaves, and also where the necrosis is beginning to spread?

Another thought, how old is this plant? Google says they live an average 15-20 years.

 

[R0b]

To me it also looks like a water availability issue. But what is the cause of that I dare not judge from pictures. Heat, salt, drought, overwatering, vascular pathogen are all options. 120 fahrenheit is an issue for all but the most heat tolerant plants. What is the soil composition?

Entering a chop stick in the soil to help monitor humidity, let it dry out between waterings and a careful repot is what I would do.