Sick outdoor plant please help

Last couple days I've noticed my plant starting to turn yellow in a section of the plant . There's no dropping and I know it's natural for the plants to start n turn yellow this time of year , but this is a large section that's getting sick . I have no idea what could cause this . Please help with any suggestions that might fix the problem . I soaked the guy this morning hoping to flush it out . I also used a root fungicide . I switched over from 15-5-5 to bone meal n sugar . Perhaps it needs nitrogen ?

Check the health of the branches under that section... if it's looking dry, woody, yellowish/ brownish-- its dying, you won't be able to revive that section in any case-- I would remove it...

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The last time I saw a section of plant die off like that it was at Nuggs and it was Russett Mites. Could be something messing with the roots too though.. Good luck man!

I've been spraying very heavily for Russit mites all season . I was thinking it was a root problem but not sure . The under growth of the plant died off first very fast . The leafs turn brown quickly n the top of the branch leafs are yellow . I used hydrogaurd for the roots hoping that could help and a fungicide . Any suggestions ? I water very heavy to try n flush .