Never had spider mites when I’ve had this but it kills basically anything on contact, ...

... I used it when I had aphids and they never came back. It’s 0.20% pyrethrins so after the leaves dry I spray it off with just water in a mister.

From everything I’ve seen and used for pests that comes in a bottle or can, this is by far the best for me .

I also use this to throw em off and it has been working perfectly well too.

Happy Growing