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black spots on juniper

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Post  eaton2008 Sat Apr 24, 2010 1:17 pm

my juniper has got black spots on its foliage!!the juniper was repotted a couple of weeks ago!!

black spots on juniper DSCN9484

black spots on juniper DSCN9483

black spots on juniper DSCN9479

does anyone know if this is a bug or a fungas??what is the best treatment??


Last edited by eaton2008 on Mon Apr 26, 2010 9:46 pm; edited 1 time in total
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Post  Guest Sat Apr 24, 2010 1:46 pm

Looks like a fungus to me but hold off with treatment until someone gives more specific diagnosis. Haven't seen this one before.

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Post  Guest Mon Apr 26, 2010 5:55 pm

Has anyone seen this before?

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Post  JimLewis Mon Apr 26, 2010 9:42 pm

Not me.
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Post  Kev Bailey Tue Apr 27, 2010 9:24 am

Nor me, sorry. Nina, heeeelp!
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Post  AlainK Tue Apr 27, 2010 12:04 pm

I haven't either... Confused

Too small to be a type of black scales in early developement ?...
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Post  JimLewis Tue Apr 27, 2010 2:38 pm

Maybe just dirt?
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black spots on juniper Empty Phomopsis blight?

Post  Geoline Tue Apr 27, 2010 3:03 pm

Notice how the spots are infecting juvenile growth and the juvenile growth is not a healthy color. Perhaps this is Phomopsis blight as described in the following PDF document:

http://www.utextension.utk.edu/publications/spfiles/SP277-B.pdf

I have seen this kind of spotting occur in places like home improvement garden centers in an enclosed greenhouse where there are overhead water misters and the environment becomes way too humid for junipers. For example, the greenhouse is set up to grow primarily tropicals year round but they bring in popular conifers for their spring sale. Guess what happens to those conifers who are not native to a wet tropical environment?

I'm kind of allergic to conifers in general so I'm not the best person to give advice on Phomopsis blight.

Good luck and hugs to Nina!
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Post  stavros Tue Dec 28, 2010 7:41 pm

Hi, i cannot offer any advice on the problem, on the contrary i am having a similar problem and i would like to ask if there is any remedy for it.
I haven't seen any bugs, scale, or black spots, and the trees tend to grow,but some new needle turn brown.

Help!

black spots on juniper Junipe14black spots on juniper Junipe15

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Post  Dan r56 Fri May 06, 2011 8:03 am

Hi, I have had these spots on my juniper for a year or more. I think it is a fungus and have tried fungus fighter but with no results, if you use a tooth brush gently they do come off.

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Post  PkWk Fri May 06, 2011 2:34 pm

I have that too on my juniper before but not knowing what exactly what it was.
I got rid of them by using a not so strong air jet blown them off from the leaves.

Good luck.

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Post  Billy M. Rhodes Fri May 06, 2011 3:59 pm

Stavros

If you are keeping your plants indoors that is the problem along with over watering and/or staying too wet.
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Post  Orion Fri May 06, 2011 4:00 pm

The closest I have seen to the black spot were dead aphids. I don't know if aphids take after junipers, I've never had them on mine, but I've had them on crabapples. After I treated them with neem, the aphids will turn black after they die off.
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Post  stavros Fri May 06, 2011 4:42 pm

Billy M. Rhodes wrote:Stavros

If you are keeping your plants indoors that is the problem along with over watering and/or staying too wet.

I have never kept any plant indoors. I use 80% (at least) inorganic substrate 3-6mm and it is almost impossible to overwater unless you sit the pot in a tray with water.
One of the things that can happen though is that due to constant high temperatures 38-45C (100-115F) and high humidity during late July-August the trees and plants shut down their systems (they go dormant) and they cannot absorb all the water from the pot. The potted substrate becomes overwatered even if is watered properly and it is also prone to fungal attack. In this case, the tips may "burn" and go brown, the tree may be underwatered because it cannot absorb water effectively and signs of overwatering may appear. This is my humble diagnosis......sorry but i have to find a cause and end up to a diagnosis with everything (my "professional" part of the brain takes over lol! )

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Post  Guest Tue May 17, 2011 2:41 am

If I didn't know better (and I'm not sure even of that) those look like the little poo's left behind by thrips. But what would thrips want with a juniper?

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Post  bonsaisr Tue May 17, 2011 3:11 am

It looks more like an insect than a fungus. Have you examined it under a magnifying glass? In England, of all places, there must be extension agents or some sort of horticultural resource. Contact Kew; they can probably refer you to somebody.
Hi, Geoline. Haven't heard from you in ages.
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