The Q&A Archives: Knats in my Salvia

Question: I noticed one of my Salvia plants leaves were looking a faded green, with further inspection knats were down inside the plant. I sprayed the plant with High Yield 38, but so far the plant still looks bad. What else can I do? Thank You

Answer: If you've tried using a gnat control product and it isn't working, perhaps you're not dealing with gnats but with black bean aphids. They look the same: they congregate on stems and leaves. But gnats fly away when you touch the plant and aphids do not. In fact, aphid feeding will cause the leaves to yellow but the presence of gnats won't have any affect on the leaves. So, try spraying with insecticidal soap. It is deadly to aphids.

Good luck with your salvia!

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