>Additional ingredients were soap ...
As I suspect that we all know, soapy water makes a very effective spray to kill many pests in the garden (why do farmers not just spray soapy water???).
However, thymol - which was not directly mentioned - is a very effective pesticide; I use it to kill white fly on African violet house plants. Just put the pot in a polythene bag with thymol crystals for a day or two and all the white fly will die with no harm to the plant.
Best wishes
Peter
52°14'44.44"N, 1°50'35"W
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