What is it and how do I get rid of it?

Yep, that is SVG. It makes really bad hay because it’s all stem and no leaf. The horses pick through it. I used to have problems with it but once I got my fertility up and plant density higher, it disappeared.

PS I took your picture and my app identified it as SVG as well.

Hayman1 said:

I test and fertilize per test annually, as in 170# k. I overseeding regularly. I see the results from fertilizing and liming in subsequent tests. I am having a hard time buying into it’s just fertility, or plant population.

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I don’t know exactly what causes it or what makes it go away, that’s just what it correlated with in my case. It just eventually went away. It might be more prone to grow in drought years.