Imidacloprid rules Kills everything except caterpillars and red spider mites. For that I simply use warm water and submerge the entire plant. Biological systemics are bad. Its good that they help our enviroment but its bad that they simply have no effect on the things you want to kill. I used bayer advanced and I get brown spots and yellow growth with my cacti. If cacti don't like the stuff then no plant will