So far I haven't used Bio SI, but I took at look at the information on the web site. This is a product with microbial activity for making healthier soil, so it isn't something I would be spraying in a foliar application.
As a rule of thumb, I tend not to add products with living organisms into a mix of anything that is meant to control pests, but I do mix it in with fertilizing products. So I would mix Thrive or Bt or Bio SI in with water and a liquid organic fertilizer (like fish fertilizer) or molasses, but I wouldn't add orange oil or juice from soaking corn meal, or neem, etc., that would kill the bio part of the mix. And when I use things like Thrive or when I spread beneficial nematodes, they go on the soil, not on plant leaves.
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