Thanks to you for your preview answer. Sorry, I don't speak English, and I probably didn't express myself correctly. I wasn't referring to a systemic pesticide (one that enters the plant's body, making it toxic), but rather a pesticide that works when the insect ingests it, not just when it touches it.
But if it only works by contact, then what's the role of JMS in PMJ? Decyl glucoside also works well by contact at 1:500 without JHS.
Thanks to you Master Cho.