Malathion mixed on the ‘hot’ end of the spectrum in the instructions will kill everything but your trees but I suggest protecting yourself when spraying, I.e. glasses, mask, etc. Supposedly also good to water the trees and give a bit of drying time and commence with the chemical warfare in the...
I wish bonsai were mainstream and I could run down to Target or Walmart and grab some akadama, pumice, and quality pots. Maybe grab some 2 mm wire at checkout next to the gum, beef jerky, and the soda cooler lol.