Interestingly, DDT is fairly simple to make if you have the precursor chemicals. There's the rub. Chloral Hydrate, the precursor to DDT, is a controlled substance. So really have to make Chloral Hydrate first, and then the DDT. The recipes are available on the internet. If you can make a chocolate cake from scratch, then homemade DDT is a cinch.
BTW, the Asian Long horned beetle is one that will devistate all broad leaf trees nationwide if left to get loose. That is..Oaks, Maples, Aspens, Popplars, Ashes, etc.