Almost free horticultural soap recipe. Saved an olive tree of mine from certain death from scale..... Works great on mites.
Combine 100ml light, food safe oil (vegetable, mineral etc) with 20ml of gentle soap (Castile or clear liquid hand soap)
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Add 20ml of the above solution to 1 liter of water in a spray bottle or garden sprayer.... This is not a poison. It basically suffocates them. The oil does the heavy lifting and the soap acts as an emulsifier and reduces the surface tension allowing it to flow where it's needed. (into the pests)