The best replacement for ddt is deet.

The best alternatives to ddt are rated as following:
★★★★★  deet
★★★★★  malaria
★★  nirvana int
★  pcb
★  sucralose
  totalview
  dde
  agent orange

Your alternative for ddt is not listed? Suggest!
Speaking about ddt, one probably shouldn't forget about malaria.

Other search terms related to ddt and their ratings are:
★★★★★ malaria
★★★ rachel carson
★★ bald eagles
You have in mind a companion for ddt and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ddt in all years. Click on graph for more.
ddt
deet
malaria