Golden Orange Jelly Like Fungus On Juniper

Filed Under: Groundcover Plants · Keywords: Orange, Gold, Jelly, Fungus, Growths, Juniper · 3202 Views
The whole front yard of my property is covered with creeping juniper. Today I noticed some ugly sleazy yellow fungus? bloom? disease? on each and every plant? All junipers are covered ..What is it? And what do I need to do about it? my concern that it may destroy the entire ground cover ... Please kindly suggest what to do. Perhaps, nothing to be worried about?


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Brent Wilson

Brent Wilson · Gardenality Administrator · Zone 8A · 10° to 15° F
Could you upload a picture of the junipers with the yellow fungus on them? This will help for identification. It could be cedar-apple rust. This disease spreads from junipers to the apple and then back to juniper. Seeing a picture will help. Click on the Upload A Picture link to the right of your name above...right next to the 'Edit your question" link. If you have problems uploading a picture I have this question: Are there golden-orange gelatinous growth (galls) on the plants? - Brent

2 years ago ·
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Answer #2 · John Heider's Answer · Hi Irina-I was interested in your question and Brent and Brooks answer regarding the fungus on your junipers. I have never had this disease on the few junipers I have grown through the years. I found a few pictures of the Cedar-apple rust I felt you may be interested in seeing. Just click on the pictures below to see what this disease looks like on junipers. As Brent said, if possible upload the pictures of your plants so he can make a possitive identification as to what problem actually exists with your plants.

John)


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Picture about Golden Orange Jelly Like Fungus On Juniper Picture about Golden Orange Jelly Like Fungus On Juniper Picture about Golden Orange Jelly Like Fungus On Juniper


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Answer #1 · Brooks Wilson's Answer · Hi Irina,

If you have Apple Trees near by it may be Cedar Apple Rust. Cedar Apple Rust, however, does have more of an orange color. The way you've described your problem above does make it sound a lot like Cedar Apple Rust.

During rainy, wet weather in the spring, spore horns develop from galls on infected junipers. Spores are spread via wind and rain to leaves on apple and crabapple trees. Infected leaves will develop obvious yellow-orange-red spots apparent from both the upper and lower leaf surfaces. In late summer, hair-like tendrils develop on the underside of infected leaves. Spores from these tendrils spread to susceptible junipers and infection occurs. The fungus grows within juniper twig tissue for approximately 20 months, forming an enlarging gall on the twig. Cedar-hawthorn rust and cedar-quince rust have similar life cycles to cedar-apple rust.

The rust fungi are dependent upon both the juniper host and the alternate (apple, crabapple, hawthorn, or quince) hosts for survival. Removal of one or the other breaks the life cycle of the fungus, preventing disease. A distance of ¼ mile between junipers and alternative hosts is helpful. In late winter, remove and destroy galls on junipers. Usually, rust does not cause sufficient injury to warrant fungicides. If it is a chronic problem, causing leaf drop and poor tree vigor, registered fungicides may be used on apples, crabapples, hawthorn and quince. This should be done at 7-10 day intervals when juniper galls are producing spore horns. When
spring weather is dry, fungicide applications are generally not required.

Brooks Wilson)


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Irina Chi

Irina Chi · Gardenality Seed · Zone 8A · 10° to 15° F
Many many thanks to Bren and Brooks! The fungus looks just like on the third picture posted by John. Thank you all for the reply! Hoping to get more details on my future questions on treatment of the fungus. Grateful Irina

2 years ago ·
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Answer #3 · Brent Wilson's Answer · Here's some details for treatment. Since it's not practical to remove the host plant and trees: the juniper or the apple, crabapple, hawthorn, or quince, the best method for treatment will be to remove cedar-apple rust galls from the junipers, and spray the other hosts (apples, etc.) with a fungicide. If the apples or whatever are in your neighbors yard, this might make things difficult. But you can always ask them to spray or allow you to spray. Fungicide treatment of the junipers isn't really necessary because the fungus doesn't cause injury to them.

Regarding the junipers, if practical, in late winter remove all cedar-apple rust galls from cedar and juniper. This practice will help break the disease cycle.

Apple and crabapple trees can be protected from cedar-apple rust infection by following a fungicide spray schedule starting at blossom time and continuing at 7 to 10 day intervals until the cedar galls on the junipers have stopped spreading spore. You can also time spraying to start when the first orange tendrils are seen on the galls in the cedar trees. Fungicides that can be used include: Ferbam, triforine (Funginex, labeled for apples only), chlorothalonil (Daconil 2787, crabapple only), myclobutanil (Immunox - apple or flowering crab, Eagle, Systhane - both for flowering crab only, and Rally - apple only) and triadimefon (Bayleton).

The positive side is that cedar-apple rust is not usually fatal to junipers. Hope you can get this disease under control.)



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