The only advantage DDT has over those is lower production cost, but the environmental harms per kg of DDT are greater than the production cost savings, so using it is just never a good tradeoff.
As I said, if DDT was worth using there, it was worth spending however much extra money it would have been to spray with other things instead. If it wasn’t worth that much money, it wasn’t worth spraying DDT.
And regarding “environmental harms,” from personal experience scratching myself bloody as a kid from itchy bites after going to the park in the evening, I would extinct a dozen species if mosquitoes went down with them.
The biggest problem with DDT is that it is bad for humans.
As I said, if DDT was worth using there, it was worth spending however much extra money it would have been to spray with other things instead. If it wasn’t worth that much money, it wasn’t worth spraying DDT.
The biggest problem with DDT is that it is bad for humans.