Juniper Health Issue - Interior Foliage Browning

[nuttiest]

Like bwaynef said, county extension to diagnose soil sample is great if this is happening a lot, and like guywires said, emergency repot some. Plants in stress give off signaling hormones from their roots that opportunistic bacteria/fungi can likely smell we don't even know what's going on with soil science anymore getting so complicated. The good news is we do know some pathogens and and we know effective treatment if identified.

I would do a soak, put the plants in the kiddie pool like mentioned, and instead of the recommended drench do 1/2 dose (because they are sitting in the water) A FEW kiddie pools if you have lots of plants. Don't mix the healthy with quarrantine plants.

Largest consideration how much money/time to spend 'fixing' and what plants get first treatments.

 

[eeeealmo]

What is this percentage-wise, do you have a figure(even if a guess)?

Percentage of what?

 

[Wires_Guy_wires]

I actually did a subduemaxx root soak of this tree over the weekend - just in case there was a root fungus. This tree's soil isnt the best, so it's possible there are other issues going on in there. I'll consider a repot, but i don't think i have much time left regardless of what happens lol

I've read a specific sentence that subdue maxx doesn't cure it. That's why I mentioned the broad spectrum stuff.
One of the first hits in google for "juniper root rot" leads to a page where phytophthora is mentioned and which fungicides might work.

 

[Potawatomi13]

No possibility misting foliage could help? Other thread(s) mention dry climate/nite fogs help American Junipers survive in very dry hot area and San Jose is that. Seems piling on fungicide endlessly can only harm plant in time. Maybe also suffocating foliage by now.

 

[BonjourBonsai]

I've had similar reactions when I've been too aggressive with repotting and root removal.

When did you repot them last and how much of the root ball did you remove? Did you bare root them?

 

[AshleyMammal]

I've also had similar reactions, but to aggressive use of (non-bonsai specific) fertiliser (Westland - Growmore granules)

 

[eeeealmo]

I've had similar reactions when I've been too aggressive with repotting and root removal.

When did you repot them last and how much of the root ball did you remove? Did you bare root them?

Didn't report anyone this season

I've also had similar reactions, but to aggressive use of (non-bonsai specific) fertiliser (Westland - Growmore granules)

Just using osmocote plus for fertilization

 

[Mike Corazzi]

The originator of our bonsai group says if the problem shows up at the bottom, it is something with the potting or roots.
If on the tips of foliage, it's outside influence.

 

[eeeealmo]

The originator of our bonsai group says if the problem shows up at the bottom, it is something with the potting or roots.
If on the tips of foliage, it's outside influence.

meaning the bottom of the shoot, like what i'm seeing?

 

[Mike Corazzi]

meaning the bottom of the shoot, like what i'm seeing?

Yes. If deciduous, he looks at the portion of the leaves that have issues.
Branch side, look to pot conditions. Tip side, look to outside influence.

 

[nuttiest]

Since you haven't repotted this year you should be able to pull out of containers and post photos of the roots - sides, bottoms, crown (worst sides) don't be shy!