burning bushes

I have 3 Burning Bushes left out of 4 and all 3 have yellowish spots on the leaves. What causes this? I live in Frederick, CO. and last winter we had some really warm weather. Then we got hit with a Polar Vortex. I lost 1 of my bushes. I also lost a smoke bush to that. But now the remaining 3 burning bushes have yellowish spots on the leaves. We have had a lot of rain. Is it something I need to add to the soil or something else?

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1 Comment To "burning bushes"

#1 Comment By Downtoearthdigs On 07/20/2016 @ 7:59 am

Yellowing leaves can be an indication of watering issues. Either to much or to little.
Once the plant is stressed they can become vulnerable to insects or disease.
I would make adjustment to watering and treat the plants with Neem OIl. It works as both an insecticide and fungicide. I would even treat weekly for the remaining growing season.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm ^[1]
https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm ^[2]

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[2] https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm: https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm

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