Q&A – What is wrong with my grass?
It is black.

Question:
What is wrong with my grass? It is black.
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Answer:
This is black smut. UT Extension Agent Chris Cooper explains that black smut is a fungus that appears in the cool of spring and fall especially if the grass is over fertilized. He talks about how to control the problem.
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Lawn Fertilization

Related Resources:
Smut
Smut Diseases