The yellowing of the entire juniper could be due to several causes.   A soil test could help identify any macronutrient or micronutrient deficiency .

Too much water (rainfall) might be causing a nitrogen deficiency in the soil where this juniper is located. Nitrogen is a nutrient that is mobile in the soil and can be leached out.   You may want to try applying nitrogen fertilizer.

The yellowing might also be due to an iron deficiency in the soil.  This can occur with some plants when the soil pH is 6 or higher, but mostly occurs when soil pH is 7 or higher.  If this juniper is planted close to the concrete house foundation or a concrete sidewalk, soil pH can, over time, increase as the concrete breaks down.    If your soil pH tests at 6 or higher, you may want to try an application of chelated iron to try address the deficiency.

There is also the possibility that there is a problem with Armillaria root rot, a fungal disease.   You can check for this by examining some of the roots.  If they are cream or light brown in color, this is not the problem.  If the roots are black or reddish brown, root rot could be your problem.

Bill- good to here from you.

The cultivar of this Juniper is Hollywood so at 20 ft tall b 15+ wide. It was part of 3 separate trees in a cluster. When i moved here i had to take out the center one as it was totally brown and dead. Last year I did take out multiple branches that had died figuring it was just part of our climate and die off. This year I noticed the whole tree turning yellowish. It is in the middle of garden area so it has got plenty of NPK over last 9 years with the straw bales. In the larger photo you can see second tree on left in back and it is a nice Lucious green.

We certainly got lots of rainfall and drainage appears good. I read that junipers lifespan is at 30ish. This was planted in 1972 so well established. There is no evidence of rust or galls or insect infestations...just turning yellow and drying out. Checking roots is problematic.

Since i am no longer a MG here in Lincoln County i no longer have access to the new database and local MGs not helpful.

I can try to check pH but may not be worth it. 

best

Michael Christy

Newport

Michael - Good to hear from you too.  Sorry that your juniper tree is having a problem.   

I'd recommend you try spraying a small portion of the leaves with a ferrous sulfate & water solution.  This would be a good way to see if there is an iron deficiency.   It is not a permanent solution but it might give an indication.  Check out page three of this publication - https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1415.pdf.     If it does indicate a possible iron deficiency, then you could consider adding an iron fertilizer to the soil.

Best regards