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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comYellow leaves black spots — soil problem?
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1 Comment To "Citrus acid or alkaline soul"
#1 Comment By Downtoearthdigs On 07/24/2019 @ 6:50 pm
It is likely a fungal problem.
They can tolerate just about any range of pH, but prefer to be around 6.5 to 7. Dolomitic lime will help keep the pH balanced, but you will need iron sulfate to bring that down just a bit, along with killing the fungus responsible for the issue.