Hi GG,
I purchased a quart of BT from the local big box store (Lowes) that came in liquid form; and there was no mixing involved @ all. As far as making a slit in the stem of the plant I did not do that either. I've heard and tried the method of making a slit in the plant and removing the larvae; but when I used that invasive method, the plant never seemed to recover. After injecting the BT internally to coat the stem above the point of entry, I covered the damaged area of the stem with dirt so the plant could set more roots.
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