Trike worked so well because it is an incredibly good solvent, and dissolved the internal lipid membranes of the insect cells, meaning they turned into bags of goop inside a hard chitin shell. This also means it is really good at dissolving your skin if you use it, and at a minimum it is a very good way to strip the underlying fat from under your skin as well, leading to some really bad side effects. Plus the whole dissociation into assorted hydrogen chlorides when heated up, and the contaminants in dirty solvent also turning into cyclic aromatics and other nasty organic short chain compounds when hot.
DDT however is still very popular here in Africa, where the biggest killer of people is still the mosquito, and coming in second and third is TB and HIV, followed by war. Using it correctly, in directed spraying where they will stop in the house eaves and room corners, and using coated nets, is a very effective control method, and also uses very little DDT, not like the USA where they were applying it in ratios of tons per hectare over swampy ground, killing entire ecosystems as a result.